{"title":"Back Draft \u0026 Pressure Dampers","description":"\u003cp\u003ePassive spring-return dampers for inline duct back draft protection and zone system pressure relief. BDD installs anywhere in the duct run in any mounting orientation — spring closes against reverse airflow regardless of gravity. HAC-BPD provides automatic static pressure relief when zone dampers close, preventing grille noise, VFD hunting, and HRV instability. BDH provides back draft protection at the building wall exterior. No wiring, no power, no maintenance.\u003c\/p\u003e","products":[{"product_id":"hac-bpd-back-pressure-damper-24vac","title":"HAC-BPD Back Pressure Damper — Automatic Pressure Relief, No Power Required, 4\"–20\"","description":"\u003cp\u003e\u003cem\u003eProduct image is representative only. Actual product may differ in appearance depending on size, configuration, and options selected at order.\u003c\/em\u003e\u003c\/p\u003e\n\u003cstyle\u003e\n  .hacbpd-desc * { box-sizing: border-box; margin: 0; padding: 0; }\n  .hacbpd-desc { font-family: 'Open Sans', sans-serif; color: #001F3F; line-height: 1.6; font-size: 15px; }\n\n  .hacbpd-desc__intro { font-size: 15px; line-height: 1.75; color: #374151; margin-bottom: 20px; }\n\n  .hacbpd-desc__bullets { display: flex; flex-direction: column; gap: 6px; margin-bottom: 20px; }\n  .hacbpd-desc__bullet { display: flex; align-items: flex-start; gap: 10px; }\n  .hacbpd-desc__bullet-check { color: #C8102E; font-weight: 700; font-size: 14px; flex-shrink: 0; line-height: 1.6; }\n  .hacbpd-desc__bullet-text { font-size: 14px; color: #374151; font-family: 'Open Sans', sans-serif; line-height: 1.6; }\n  .hacbpd-desc__bullet-text strong { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #001F3F; }\n\n  .hacbpd-desc__note { background: #F3F6F8; border-left: 4px solid #001F3F; border-radius: 0 4px 4px 0; padding: 12px 16px; margin-bottom: 20px; font-size: 13.5px; color: #001F3F; font-family: 'Open Sans', sans-serif; line-height: 1.6; }\n  .hacbpd-desc__note strong { font-family: 'Montserrat', sans-serif; font-weight: 700; }\n  .hacbpd-desc__note a { color: #C8102E; text-decoration: none; font-weight: 600; }\n\n  .hacbpd-desc__symptoms { background: #F3F6F8; border-radius: 6px; padding: 16px 20px; margin-bottom: 20px; display: flex; flex-direction: column; gap: 8px; }\n  .hacbpd-desc__symptom { display: flex; align-items: flex-start; gap: 10px; }\n  .hacbpd-desc__symptom-dot { color: #C8102E; font-weight: 700; font-size: 14px; flex-shrink: 0; line-height: 1.55; }\n  .hacbpd-desc__symptom-text { font-size: 13.5px; color: #374151; font-family: 'Open Sans', sans-serif; line-height: 1.55; }\n  .hacbpd-desc__symptom-text strong { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #001F3F; }\n  .hacbpd-desc__symptoms-label { font-family: 'Montserrat', sans-serif; font-size: 11px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; color: #C8102E; margin-bottom: 4px; }\n\n  .hacbpd-desc__compare { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 20px; }\n  .hacbpd-desc__compare-card { background: #F3F6F8; border: 1px solid #e2e8f0; border-radius: 5px; padding: 12px 14px; }\n  .hacbpd-desc__compare-card--red { border-top: 3px solid #C8102E; }\n  .hacbpd-desc__compare-card--navy { border-top: 3px solid #001F3F; }\n  .hacbpd-desc__compare-title { font-family: 'Montserrat', sans-serif; font-size: 12px; font-weight: 800; color: #001F3F; margin-bottom: 8px; }\n  .hacbpd-desc__compare-item { display: flex; align-items: flex-start; gap: 7px; margin-bottom: 5px; }\n  .hacbpd-desc__compare-item:last-child { margin-bottom: 0; }\n  .hacbpd-desc__compare-dot--red { color: #C8102E; font-weight: 700; font-size: 13px; flex-shrink: 0; line-height: 1.5; }\n  .hacbpd-desc__compare-dot--navy { color: #001F3F; font-weight: 700; font-size: 13px; flex-shrink: 0; line-height: 1.5; }\n  .hacbpd-desc__compare-text { font-size: 12.5px; color: #374151; font-family: 'Open Sans', sans-serif; line-height: 1.45; }\n\n  .hacbpd-desc__table-wrap { overflow-x: auto; margin-bottom: 20px; }\n  .hacbpd-desc__table { width: 100%; border-collapse: collapse; font-size: 12.5px; font-family: 'Open Sans', sans-serif; }\n  .hacbpd-desc__table th { background: #001F3F; color: #FFFFFF; font-family: 'Montserrat', sans-serif; font-weight: 700; font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.05em; padding: 8px 12px; text-align: left; white-space: nowrap; }\n  .hacbpd-desc__table td { padding: 7px 12px; border-bottom: 1px solid #e2e8f0; color: #001F3F; vertical-align: top; }\n  .hacbpd-desc__table tr:last-child td { border-bottom: none; }\n  .hacbpd-desc__table tr:nth-child(even) td { background: #f8fafc; }\n  .hacbpd-desc__table td:first-child { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #C8102E; }\n  .hacbpd-desc__table-note { font-size: 11.5px; color: #718096; font-family: 'Open Sans', sans-serif; margin-top: 6px; font-style: italic; }\n\n  .hacbpd-desc__specs { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 8px; margin-bottom: 20px; }\n  .hacbpd-desc__spec { background: #F3F6F8; border: 1px solid #e2e8f0; border-radius: 5px; padding: 10px 12px; }\n  .hacbpd-desc__spec-label { font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: #718096; margin-bottom: 3px; }\n  .hacbpd-desc__spec-value { font-family: 'Montserrat', sans-serif; font-size: 12.5px; font-weight: 700; color: #001F3F; line-height: 1.35; }\n  .hacbpd-desc__spec--highlight { background: #001F3F; border-color: #001F3F; }\n  .hacbpd-desc__spec--highlight .hacbpd-desc__spec-label { color: rgba(255,255,255,0.5); }\n  .hacbpd-desc__spec--highlight .hacbpd-desc__spec-value { color: #FFFFFF; }\n\n  .hacbpd-desc__warranty { display: flex; align-items: center; gap: 10px; background: #001F3F; border-radius: 5px; padding: 12px 16px; }\n  .hacbpd-desc__warranty-text { font-family: 'Montserrat', sans-serif; font-size: 13px; font-weight: 700; color: #FFFFFF; }\n  .hacbpd-desc__warranty-sub { font-size: 12px; color: rgba(255,255,255,0.6); font-family: 'Open Sans', sans-serif; margin-top: 2px; }\n\n  @media (max-width: 480px) {\n    .hacbpd-desc__compare { grid-template-columns: 1fr; }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"hacbpd-desc\"\u003e\n\u003cp class=\"hacbpd-desc__intro\"\u003eSpring-return mechanical back pressure damper for automatic duct static pressure relief. Opens when pressure rises above the threshold set by an adjustable counterweight — closes as pressure drops. No wiring. No control signal. No power supply. Mounts any orientation. Available 4\"–20\" including odd-inch sizes.\u003c\/p\u003e\n\u003cdiv class=\"hacbpd-desc__symptoms\"\u003e\n\u003cdiv class=\"hacbpd-desc__symptoms-label\"\u003ePressure problems this damper solves\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__symptom\"\u003e\n\u003cspan class=\"hacbpd-desc__symptom-dot\"\u003e→\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__symptom-text\"\u003e\u003cstrong\u003eGrille noise when zone dampers close\u003c\/strong\u003e — velocity increases through open zones as static builds; bypass relieves the pressure automatically\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__symptom\"\u003e\n\u003cspan class=\"hacbpd-desc__symptom-dot\"\u003e→\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__symptom-text\"\u003e\u003cstrong\u003eVFD hunting or instability\u003c\/strong\u003e — changing duct conditions as zones open and close cause the drive to chase setpoint; bypass stabilizes the system\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__symptom\"\u003e\n\u003cspan class=\"hacbpd-desc__symptom-dot\"\u003e→\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__symptom-text\"\u003e\u003cstrong\u003eHRV or ERV airflow instability\u003c\/strong\u003e — building pressurization affects HRV\/ERV performance; bypass relief in the makeup air circuit stabilizes the unit\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__symptom\"\u003e\n\u003cspan class=\"hacbpd-desc__symptom-dot\"\u003e→\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__symptom-text\"\u003e\u003cstrong\u003ePressure spikes causing nuisance trips\u003c\/strong\u003e — safeties or high-limit switches triggering on pressure events; bypass prevents the spike from reaching trip threshold\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__bullets\"\u003e\n\u003cdiv class=\"hacbpd-desc__bullet\"\u003e\n\u003cspan class=\"hacbpd-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"hacbpd-desc__bullet-text\"\u003e\u003cstrong\u003eSpring return — mounts any orientation\u003c\/strong\u003e — vertical, horizontal, inverted, or any angle; closing force is mechanical, not gravitational; installs wherever the bypass duct needs to go\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__bullet\"\u003e\n\u003cspan class=\"hacbpd-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"hacbpd-desc__bullet-text\"\u003e\u003cstrong\u003eAdjustable counterweight sets the opening threshold\u003c\/strong\u003e — set at commissioning with the system running; heavier = higher pressure required to open, lighter = more responsive\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__bullet\"\u003e\n\u003cspan class=\"hacbpd-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"hacbpd-desc__bullet-text\"\u003e\u003cstrong\u003eNo wiring, no controls, nothing to fail electrically\u003c\/strong\u003e — purely mechanical; responds to duct conditions automatically for the service life of the installation\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__bullet\"\u003e\n\u003cspan class=\"hacbpd-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"hacbpd-desc__bullet-text\"\u003e\u003cstrong\u003eFoam rubber sealed\u003c\/strong\u003e — tighter leakage control than unsealed bypass dampers; closes cleanly during normal operation so the bypass doesn't become a continuous air leak\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__bullet\"\u003e\n\u003cspan class=\"hacbpd-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"hacbpd-desc__bullet-text\"\u003e\u003cstrong\u003e4\"–20\" including odd-inch sizes\u003c\/strong\u003e — matches bypass duct diameter exactly; square and rectangular configurations available as special orders — contact factory\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__compare\"\u003e\n\u003cdiv class=\"hacbpd-desc__compare-card hacbpd-desc__compare-card--red\"\u003e\n\u003cdiv class=\"hacbpd-desc__compare-title\"\u003eHAC-BPD — use for pressure relief\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__compare-item\"\u003e\n\u003cspan class=\"hacbpd-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__compare-text\"\u003eOpens and closes automatically based on duct static pressure\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__compare-item\"\u003e\n\u003cspan class=\"hacbpd-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__compare-text\"\u003eResponds dynamically — active only when pressure rises\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__compare-item\"\u003e\n\u003cspan class=\"hacbpd-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__compare-text\"\u003eSystem protection — relieves excess pressure, closes when normal\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__compare-item\"\u003e\n\u003cspan class=\"hacbpd-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__compare-text\"\u003eInstall in bypass branch — not in main duct run\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__compare-card hacbpd-desc__compare-card--navy\"\u003e\n\u003cdiv class=\"hacbpd-desc__compare-title\"\u003eHAC-MBD — use for fixed restriction\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__compare-item\"\u003e\n\u003cspan class=\"hacbpd-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__compare-text\"\u003eSet manually at commissioning — stays at that position\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__compare-item\"\u003e\n\u003cspan class=\"hacbpd-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__compare-text\"\u003eDoes not respond to pressure changes — fixed position only\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__compare-item\"\u003e\n\u003cspan class=\"hacbpd-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__compare-text\"\u003eAirflow balancing — trims a specific flow rate and holds it\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__compare-item\"\u003e\n\u003cspan class=\"hacbpd-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"hacbpd-desc__compare-text\"\u003eInstall in supply, return, or fresh air duct run\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__table-wrap\"\u003e\n\u003ctable class=\"hacbpd-desc__table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSize\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003cth\u003eConfiguration\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e4\"\u003c\/td\u003e\n\u003ctd\u003eHAC-0400-BPD\u003c\/td\u003e\n\u003ctd\u003eSpring return, adjustable counterweight, foam sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e5\"\u003c\/td\u003e\n\u003ctd\u003eHAC-0500-BPD\u003c\/td\u003e\n\u003ctd\u003eSpring return, adjustable counterweight, foam sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6\"\u003c\/td\u003e\n\u003ctd\u003eHAC-0600-BPD\u003c\/td\u003e\n\u003ctd\u003eSpring return, adjustable counterweight, foam sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e7\"\u003c\/td\u003e\n\u003ctd\u003eHAC-0700-BPD\u003c\/td\u003e\n\u003ctd\u003eSpring return, adjustable counterweight, foam sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8\"\u003c\/td\u003e\n\u003ctd\u003eHAC-0800-BPD\u003c\/td\u003e\n\u003ctd\u003eSpring return, adjustable counterweight, foam sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e10\"\u003c\/td\u003e\n\u003ctd\u003eHAC-1000-BPD\u003c\/td\u003e\n\u003ctd\u003eSpring return, adjustable counterweight, foam sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e12\"\u003c\/td\u003e\n\u003ctd\u003eHAC-1200-BPD\u003c\/td\u003e\n\u003ctd\u003eSpring return, adjustable counterweight, foam sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e14\"\u003c\/td\u003e\n\u003ctd\u003eHAC-1400-BPD\u003c\/td\u003e\n\u003ctd\u003eSpring return, adjustable counterweight, foam sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e16\"\u003c\/td\u003e\n\u003ctd\u003eHAC-1600-BPD\u003c\/td\u003e\n\u003ctd\u003eSpring return, adjustable counterweight, foam sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e18\"\u003c\/td\u003e\n\u003ctd\u003eHAC-1800-BPD\u003c\/td\u003e\n\u003ctd\u003eSpring return, adjustable counterweight, foam sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e20\"\u003c\/td\u003e\n\u003ctd\u003eHAC-2000-BPD\u003c\/td\u003e\n\u003ctd\u003eSpring return, adjustable counterweight, foam sealed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"hacbpd-desc__table-note\"\u003eSelect diameter only — all units identical in configuration. 9\" is not available in this series. Square and rectangular configurations available as factory special orders.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__specs\"\u003e\n\u003cdiv class=\"hacbpd-desc__spec hacbpd-desc__spec--highlight\"\u003e\n\u003cdiv class=\"hacbpd-desc__spec-label\"\u003eOperation\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__spec-value\"\u003eAutomatic — no wiring, no controls\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__spec\"\u003e\n\u003cdiv class=\"hacbpd-desc__spec-label\"\u003eSizes\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__spec-value\"\u003e4\"–20\" incl. odd inches\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__spec\"\u003e\n\u003cdiv class=\"hacbpd-desc__spec-label\"\u003eFail-Safe\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__spec-value\"\u003eSpring return — any orientation\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__spec\"\u003e\n\u003cdiv class=\"hacbpd-desc__spec-label\"\u003eThreshold Setting\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__spec-value\"\u003eAdjustable counterweight — set at commissioning\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__spec\"\u003e\n\u003cdiv class=\"hacbpd-desc__spec-label\"\u003eSeal\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__spec-value\"\u003eFoam rubber — low leakage when closed\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__spec\"\u003e\n\u003cdiv class=\"hacbpd-desc__spec-label\"\u003eWarranty\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__spec-value\"\u003e10-year mechanical\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Phone number 1-800-661-7382 is pending confirmation per project notes.\n       Verify before publishing. --\u003e\n\u003cdiv class=\"hacbpd-desc__note\"\u003e\n\u003cstrong\u003eCommission with the system running.\u003c\/strong\u003e There is no factory-default counterweight setting that works for all applications. Set the counterweight with the maximum number of zones closed that would occur in normal operation. If the bypass opens during normal operation, move the counterweight heavier. If it isn't opening when noise or VFD hunting is occurring, move it lighter. Adjust until the bypass activates only when excess pressure is present and closes cleanly during normal operation. Need help sizing the bypass branch? Contact \u003ca href=\"tel:18006617382\"\u003e1-800-661-7382\u003c\/a\u003e.\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__warranty\"\u003e\n\u003csvg width=\"20\" height=\"20\" viewbox=\"0 0 24 24\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" style=\"flex-shrink: 0;\"\u003e\n      \u003cpath d=\"M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z\" stroke=\"#C8102E\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003c\/path\u003e\n      \u003cpath d=\"M9 12l2 2 4-4\" stroke=\"#C8102E\" stroke-width=\"1.8\" stroke-linecap=\"round\" stroke-linejoin=\"round\"\u003e\u003c\/path\u003e\n    \u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"hacbpd-desc__warranty-text\"\u003e10-year mechanical warranty\u003c\/div\u003e\n\u003cdiv class=\"hacbpd-desc__warranty-sub\"\u003eMade in Canada · No wiring, no controls, nothing to fail electrically\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Hoyme Manufacturing","offers":[{"title":"4\"","offer_id":43091426443307,"sku":"HAC-0400-BPD","price":206.0,"currency_code":"CAD","in_stock":true},{"title":"5\"","offer_id":43091426508843,"sku":"HAC-0500-BPD","price":210.0,"currency_code":"CAD","in_stock":true},{"title":"6\"","offer_id":43091426574379,"sku":"HAC-0600-BPD","price":216.0,"currency_code":"CAD","in_stock":true},{"title":"7\"","offer_id":43091426639915,"sku":"HAC-0700-BPD","price":219.0,"currency_code":"CAD","in_stock":true},{"title":"8\"","offer_id":43091426705451,"sku":"HAC-0800-BPD","price":224.0,"currency_code":"CAD","in_stock":true},{"title":"10\"","offer_id":43091426770987,"sku":"HAC-1000-BPD","price":298.0,"currency_code":"CAD","in_stock":true},{"title":"12\"","offer_id":43091426836523,"sku":"HAC-1200-BPD","price":307.0,"currency_code":"CAD","in_stock":true},{"title":"14\"","offer_id":43091426902059,"sku":"HAC-1400-BPD","price":315.0,"currency_code":"CAD","in_stock":true},{"title":"16\"","offer_id":43091426967595,"sku":"HAC-1600-BPD","price":327.0,"currency_code":"CAD","in_stock":true},{"title":"18\"","offer_id":43091427033131,"sku":"HAC-1800-BPD","price":334.0,"currency_code":"CAD","in_stock":true},{"title":"20\"","offer_id":43091427098667,"sku":"HAC-2000-BPD","price":345.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0647\/3459\/3067\/files\/image_75.png?v=1775768736"},{"product_id":"bdh-back-draft-hood-spring-gravity-4-12in","title":"BDH Back Draft Hood — Outlet Exhaust Termination, Spring or Gravity Closed, 4\"–12\"","description":"\u003cp\u003e\u003cem\u003eProduct image is representative only. Actual product may differ in appearance depending on size, configuration, and options selected at order.\u003c\/em\u003e\u003c\/p\u003e\n\u003cstyle\u003e\n  .bdh-desc * { box-sizing: border-box; margin: 0; padding: 0; }\n  .bdh-desc { font-family: 'Open Sans', sans-serif; color: #001F3F; line-height: 1.6; font-size: 15px; }\n\n  .bdh-desc__intro { font-size: 15px; line-height: 1.75; color: #374151; margin-bottom: 20px; }\n\n  .bdh-desc__bullets { display: flex; flex-direction: column; gap: 6px; margin-bottom: 20px; }\n  .bdh-desc__bullet { display: flex; align-items: flex-start; gap: 10px; }\n  .bdh-desc__bullet-check { color: #C8102E; font-weight: 700; font-size: 14px; flex-shrink: 0; line-height: 1.6; }\n  .bdh-desc__bullet-text { font-size: 14px; color: #374151; font-family: 'Open Sans', sans-serif; line-height: 1.6; }\n  .bdh-desc__bullet-text strong { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #001F3F; }\n\n  .bdh-desc__warning { background: #fff3f4; border-left: 4px solid #C8102E; border-radius: 0 4px 4px 0; padding: 12px 16px; margin-bottom: 20px; font-size: 13.5px; color: #001F3F; font-family: 'Open Sans', sans-serif; line-height: 1.6; }\n  .bdh-desc__warning strong { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #C8102E; }\n\n  .bdh-desc__note { background: #F3F6F8; border-left: 4px solid #001F3F; border-radius: 0 4px 4px 0; padding: 12px 16px; margin-bottom: 20px; font-size: 13.5px; color: #001F3F; font-family: 'Open Sans', sans-serif; line-height: 1.6; }\n  .bdh-desc__note strong { font-family: 'Montserrat', sans-serif; font-weight: 700; }\n  .bdh-desc__note a { color: #C8102E; text-decoration: none; font-weight: 600; }\n\n  .bdh-desc__compare { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 20px; }\n  .bdh-desc__compare-card { background: #F3F6F8; border: 1px solid #e2e8f0; border-radius: 5px; padding: 12px 14px; }\n  .bdh-desc__compare-card--red { border-top: 3px solid #C8102E; }\n  .bdh-desc__compare-card--navy { border-top: 3px solid #001F3F; }\n  .bdh-desc__compare-title { font-family: 'Montserrat', sans-serif; font-size: 13px; font-weight: 800; color: #001F3F; margin-bottom: 8px; }\n  .bdh-desc__compare-item { display: flex; align-items: flex-start; gap: 7px; margin-bottom: 5px; }\n  .bdh-desc__compare-item:last-child { margin-bottom: 0; }\n  .bdh-desc__compare-dot--red { color: #C8102E; font-weight: 700; font-size: 13px; flex-shrink: 0; line-height: 1.5; }\n  .bdh-desc__compare-dot--navy { color: #001F3F; font-weight: 700; font-size: 13px; flex-shrink: 0; line-height: 1.5; }\n  .bdh-desc__compare-text { font-size: 12.5px; color: #374151; font-family: 'Open Sans', sans-serif; line-height: 1.45; }\n\n  .bdh-desc__specs { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 8px; margin-bottom: 20px; }\n  .bdh-desc__spec { background: #F3F6F8; border: 1px solid #e2e8f0; border-radius: 5px; padding: 10px 12px; }\n  .bdh-desc__spec-label { font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: #718096; margin-bottom: 3px; }\n  .bdh-desc__spec-value { font-family: 'Montserrat', sans-serif; font-size: 12.5px; font-weight: 700; color: #001F3F; line-height: 1.35; }\n  .bdh-desc__spec--highlight { background: #001F3F; border-color: #001F3F; }\n  .bdh-desc__spec--highlight .bdh-desc__spec-label { color: rgba(255,255,255,0.5); }\n  .bdh-desc__spec--highlight .bdh-desc__spec-value { color: #FFFFFF; }\n  .bdh-desc__spec--red { background: #fff3f4; border-color: #C8102E; }\n  .bdh-desc__spec--red .bdh-desc__spec-label { color: #C8102E; }\n  .bdh-desc__spec--red .bdh-desc__spec-value { color: #C8102E; }\n  .bdh-desc__spec--amber { background: #fffbeb; border-color: #d97706; }\n  .bdh-desc__spec--amber .bdh-desc__spec-label { color: #92400e; }\n  .bdh-desc__spec--amber .bdh-desc__spec-value { color: #92400e; }\n\n  .bdh-desc__table-wrap { overflow-x: auto; margin-bottom: 20px; }\n  .bdh-desc__table { width: 100%; border-collapse: collapse; font-size: 12.5px; font-family: 'Open Sans', sans-serif; }\n  .bdh-desc__table th { background: #001F3F; color: #FFFFFF; font-family: 'Montserrat', sans-serif; font-weight: 700; font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.05em; padding: 8px 12px; text-align: left; white-space: nowrap; }\n  .bdh-desc__table td { padding: 7px 12px; border-bottom: 1px solid #e2e8f0; color: #001F3F; vertical-align: top; }\n  .bdh-desc__table tr:last-child td { border-bottom: none; }\n  .bdh-desc__table tr:nth-child(even) td { background: #f8fafc; }\n  .bdh-desc__table td:first-child { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #C8102E; }\n  .bdh-desc__table-note { font-size: 11.5px; color: #718096; font-family: 'Open Sans', sans-serif; margin-top: 6px; font-style: italic; }\n\n  .bdh-desc__warranty { display: flex; align-items: center; gap: 10px; background: #001F3F; border-radius: 5px; padding: 12px 16px; }\n  .bdh-desc__warranty-text { font-family: 'Montserrat', sans-serif; font-size: 13px; font-weight: 700; color: #FFFFFF; }\n  .bdh-desc__warranty-sub { font-size: 12px; color: rgba(255,255,255,0.6); font-family: 'Open Sans', sans-serif; margin-top: 2px; }\n\n  @media (max-width: 480px) {\n    .bdh-desc__compare { grid-template-columns: 1fr; }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"bdh-desc\"\u003e\n\n  \u003cp class=\"bdh-desc__intro\"\u003eBack draft hood for exhaust duct terminations at the building exterior — dryer, bathroom fan, kitchen exhaust, HRV\/ERV exhaust port, or any exhaust duct at the wall. Opens when the fan runs, closes when it stops. No wiring. No power. No maintenance. Spring closed models mount any orientation. Gravity closed models for horizontal discharge. Sizes 4\"–12\".\u003c\/p\u003e\n\n  \u003cdiv class=\"bdh-desc__bullets\"\u003e\n\n    \u003cdiv class=\"bdh-desc__bullet\"\u003e\n      \u003cspan class=\"bdh-desc__bullet-check\"\u003e✓\u003c\/span\u003e\n      \u003cspan class=\"bdh-desc__bullet-text\"\u003e\u003cstrong\u003eOutlet only — closes when the fan stops\u003c\/strong\u003e — eliminates the open path for outdoor air, cold, and pests that exists at every exhaust termination without a closing damper\u003c\/span\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"bdh-desc__bullet\"\u003e\n      \u003cspan class=\"bdh-desc__bullet-check\"\u003e✓\u003c\/span\u003e\n      \u003cspan class=\"bdh-desc__bullet-text\"\u003e\u003cstrong\u003eSpring closed — mounts any orientation\u003c\/strong\u003e — vertical, horizontal, or angled; spring provides consistent closing force regardless of gravity; the correct specification for dryer exhaust\u003c\/span\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"bdh-desc__bullet\"\u003e\n      \u003cspan class=\"bdh-desc__bullet-check\"\u003e✓\u003c\/span\u003e\n      \u003cspan class=\"bdh-desc__bullet-text\"\u003e\u003cstrong\u003eGravity closed — quieter, aesthetic priority\u003c\/strong\u003e — lighter operation on horizontal discharge; defaults to painted white for white-siding installations; not suitable for vertical or angled discharge\u003c\/span\u003e\n    \u003c\/div\u003e\n\n    \u003c!-- CORRECTION 1: Original said \"End switch available on spring closed models\" with no\n         size qualification. Price list only lists S00 variants at 4\", 5\", and 6\" — zero S00\n         entries exist for 7\", 8\", 9\", 10\", or 12\". Source document does not restrict end\n         switch by size but price list is authoritative. Qualification added. --\u003e\n    \u003cdiv class=\"bdh-desc__bullet\"\u003e\n      \u003cspan class=\"bdh-desc__bullet-check\"\u003e✓\u003c\/span\u003e\n      \u003cspan class=\"bdh-desc__bullet-text\"\u003e\u003cstrong\u003eEnd switch available on spring closed models at 4\", 5\", and 6\"\u003c\/strong\u003e — proves hood-open position for fan proving circuits, ventilation interlock sequences, or dryer proving requirements; not available on gravity closed or on spring closed models larger than 6\"\u003c\/span\u003e\n    \u003c\/div\u003e\n\n    \u003cdiv class=\"bdh-desc__bullet\"\u003e\n      \u003cspan class=\"bdh-desc__bullet-check\"\u003e✓\u003c\/span\u003e\n      \u003cspan class=\"bdh-desc__bullet-text\"\u003e\u003cstrong\u003eBoth finishes available on both styles\u003c\/strong\u003e — spring closed defaults to regular metal, gravity closed defaults to painted white; specify alternate finish at order if needed\u003c\/span\u003e\n    \u003c\/div\u003e\n\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"bdh-desc__warning\"\u003e\n    \u003cstrong\u003eOutlet only — not for fresh air intake applications.\u003c\/strong\u003e On an inlet, outdoor air pressure pushes the BDH open and holds it open with no control. For passive fresh air intake termination use the \u003ca style=\"color: #c8102e; text-decoration: none; font-weight: 600;\" href=\"\/products\/ooh-all-weather-inlet-hood-4-12in\"\u003eOOH All Weather Hood\u003c\/a\u003e. For powered open\/close at the wall use the \u003ca style=\"color: #c8102e; text-decoration: none; font-weight: 600;\" href=\"\/products\/moh-motorized-all-weather-hood-damper\"\u003eMOH Motorized All-Weather Hood\u003c\/a\u003e.\u003c\/div\u003e\n\n  \u003cdiv class=\"bdh-desc__compare\"\u003e\n    \u003cdiv class=\"bdh-desc__compare-card bdh-desc__compare-card--red\"\u003e\n      \u003cdiv class=\"bdh-desc__compare-title\"\u003eSpring Closed — specify when…\u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__compare-item\"\u003e\n        \u003cspan class=\"bdh-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"bdh-desc__compare-text\"\u003eDryer exhaust — always spring closed\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__compare-item\"\u003e\n        \u003cspan class=\"bdh-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"bdh-desc__compare-text\"\u003eVertical or angled discharge — spring closes reliably in any orientation\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__compare-item\"\u003e\n        \u003cspan class=\"bdh-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"bdh-desc__compare-text\"\u003eFan proving or interlock circuit required — end switch available at 4\", 5\", 6\"\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__compare-item\"\u003e\n        \u003cspan class=\"bdh-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"bdh-desc__compare-text\"\u003eAny orientation uncertainty — spring is the safer default\u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"bdh-desc__compare-card bdh-desc__compare-card--navy\"\u003e\n      \u003cdiv class=\"bdh-desc__compare-title\"\u003eGravity Closed — specify when…\u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__compare-item\"\u003e\n        \u003cspan class=\"bdh-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"bdh-desc__compare-text\"\u003eConfirmed horizontal discharge only\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__compare-item\"\u003e\n        \u003cspan class=\"bdh-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"bdh-desc__compare-text\"\u003eQuieter operation is preferred — lighter mechanical action\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__compare-item\"\u003e\n        \u003cspan class=\"bdh-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"bdh-desc__compare-text\"\u003eWhite siding installation — painted white is the default finish\u003c\/span\u003e\n      \u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__compare-item\"\u003e\n        \u003cspan class=\"bdh-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"bdh-desc__compare-text\"\u003eNo fan proving or interlock circuit required\u003c\/span\u003e\n      \u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- CORRECTION 2: Added size availability table with 11\" not available note.\n       Price list: BDH-0400 through BDH-1200 — skips 1100 (11\"). Source document's\n       How to Order section lists \"4\", 5\", 6\", 7\", 8\", 9\", 10\", or 12\"\" — no 11\".\n       Consistent with notes added to HAC-BPD, HAC-MBD, HAC No Motor this session. --\u003e\n  \u003cdiv class=\"bdh-desc__table-wrap\"\u003e\n    \u003ctable class=\"bdh-desc__table\"\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eSize\u003c\/th\u003e\n          \u003cth\u003eSpring Closed\u003c\/th\u003e\n          \u003cth\u003eSpring Closed + End Switch\u003c\/th\u003e\n          \u003cth\u003eGravity Closed\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n\u003ctd\u003e4\"\u003c\/td\u003e\n\u003ctd\u003eBDH-0400-000\u003c\/td\u003e\n\u003ctd\u003eBDH-0400-S00\u003c\/td\u003e\n\u003ctd\u003eBDH-0400-000-G\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e5\"\u003c\/td\u003e\n\u003ctd\u003eBDH-0500-000\u003c\/td\u003e\n\u003ctd\u003eBDH-0500-S00\u003c\/td\u003e\n\u003ctd\u003eBDH-0500-000-G\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e6\"\u003c\/td\u003e\n\u003ctd\u003eBDH-0600-000\u003c\/td\u003e\n\u003ctd\u003eBDH-0600-S00\u003c\/td\u003e\n\u003ctd\u003eBDH-0600-000-G\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e7\"\u003c\/td\u003e\n\u003ctd\u003eBDH-0700-000\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003eBDH-0700-000-G\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e8\"\u003c\/td\u003e\n\u003ctd\u003eBDH-0800-000\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003eBDH-0800-000-G\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e9\"\u003c\/td\u003e\n\u003ctd\u003eBDH-0900-000\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003eBDH-0900-000-G\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e10\"\u003c\/td\u003e\n\u003ctd\u003eBDH-1000-000\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003eBDH-1000-000-G\u003c\/td\u003e\n\u003c\/tr\u003e\n        \u003ctr\u003e\n\u003ctd\u003e12\"\u003c\/td\u003e\n\u003ctd\u003eBDH-1200-000\u003c\/td\u003e\n\u003ctd\u003e—\u003c\/td\u003e\n\u003ctd\u003eBDH-1200-000-G\u003c\/td\u003e\n\u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n    \u003cdiv class=\"bdh-desc__table-note\"\u003e11\" is not available in this series. End switch (S00) is only listed in the standard price book at 4\", 5\", and 6\" — confirm availability at larger sizes with your wholesaler before ordering.\u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"bdh-desc__specs\"\u003e\n    \u003cdiv class=\"bdh-desc__spec bdh-desc__spec--highlight\"\u003e\n      \u003cdiv class=\"bdh-desc__spec-label\"\u003eApplication\u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__spec-value\"\u003eOutlet only — exhaust termination\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"bdh-desc__spec\"\u003e\n      \u003cdiv class=\"bdh-desc__spec-label\"\u003eSizes\u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__spec-value\"\u003e4\"–12\" (no 11\")\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"bdh-desc__spec\"\u003e\n      \u003cdiv class=\"bdh-desc__spec-label\"\u003eStyles\u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__spec-value\"\u003eSpring closed \/ Gravity closed\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"bdh-desc__spec\"\u003e\n      \u003cdiv class=\"bdh-desc__spec-label\"\u003eEnd Switch\u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__spec-value\"\u003eSpring closed, 4\"–6\" only\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"bdh-desc__spec bdh-desc__spec--red\"\u003e\n      \u003cdiv class=\"bdh-desc__spec-label\"\u003eNot Suitable For\u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__spec-value\"\u003eInlet applications — use OOH or MOH\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"bdh-desc__spec bdh-desc__spec--amber\"\u003e\n      \u003cdiv class=\"bdh-desc__spec-label\"\u003eGravity Closed Mounting\u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__spec-value\"\u003eHorizontal discharge only\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"bdh-desc__spec\"\u003e\n      \u003cdiv class=\"bdh-desc__spec-label\"\u003eOperation\u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__spec-value\"\u003eNo power, no wiring required\u003c\/div\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"bdh-desc__spec\"\u003e\n      \u003cdiv class=\"bdh-desc__spec-label\"\u003eWarranty\u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__spec-value\"\u003e10-year mechanical\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"bdh-desc__note\"\u003e\n    \u003cstrong\u003eNeed to confirm actual airflow in the duct run — not just hood position?\u003c\/strong\u003e The end switch proves the hood has opened, not that a specific flow rate is achieved. For precise airflow confirmation use the \u003ca href=\"\/products\/pfs-positive-flow-switch\"\u003ePFS Positive Flow Switch\u003c\/a\u003e inline in the duct run. For an inline back draft damper (not at-wall termination) see the \u003ca href=\"\/products\/bdd-back-draft-damper\"\u003eBDD Back Draft Damper\u003c\/a\u003e.\u003c\/div\u003e\n\n  \u003cdiv class=\"bdh-desc__warranty\"\u003e\n    \u003csvg style=\"flex-shrink: 0;\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" fill=\"none\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\"\u003e\n      \u003cpath stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.8\" stroke=\"#C8102E\" d=\"M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z\"\u003e\u003c\/path\u003e\n      \u003cpath stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.8\" stroke=\"#C8102E\" d=\"M9 12l2 2 4-4\"\u003e\u003c\/path\u003e\n    \u003c\/svg\u003e\n    \u003cdiv\u003e\n      \u003cdiv class=\"bdh-desc__warranty-text\"\u003e10-year mechanical warranty\u003c\/div\u003e\n      \u003cdiv class=\"bdh-desc__warranty-sub\"\u003eMade in Canada  ·  No motor, no wiring, nothing to fail electrically\u003c\/div\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n\u003c\/div\u003e","brand":"Hoyme Manufacturing","offers":[{"title":"4\" \/ Spring Closed","offer_id":43337708503083,"sku":"BDH-0400-000","price":79.0,"currency_code":"CAD","in_stock":true},{"title":"4\" \/ Spring Closed + End Switch","offer_id":43337708535851,"sku":"BDH-0400-S00","price":108.0,"currency_code":"CAD","in_stock":true},{"title":"4\" \/ Gravity Closed","offer_id":43337708568619,"sku":"BDH-0400-000-G","price":79.0,"currency_code":"CAD","in_stock":true},{"title":"5\" \/ Spring Closed","offer_id":43337708601387,"sku":"BDH-0500-000","price":87.0,"currency_code":"CAD","in_stock":true},{"title":"5\" \/ Spring Closed + End Switch","offer_id":43337708634155,"sku":"BDH-0500-S00","price":116.0,"currency_code":"CAD","in_stock":true},{"title":"5\" \/ Gravity Closed","offer_id":43337708666923,"sku":"BDH-0500-000-G","price":87.0,"currency_code":"CAD","in_stock":true},{"title":"6\" \/ Spring Closed","offer_id":43337708699691,"sku":"BDH-0600-000","price":96.0,"currency_code":"CAD","in_stock":true},{"title":"6\" \/ Spring Closed + End Switch","offer_id":43337708732459,"sku":"BDH-0600-S00","price":123.0,"currency_code":"CAD","in_stock":true},{"title":"6\" \/ Gravity Closed","offer_id":43337708765227,"sku":"BDH-0600-000-G","price":96.0,"currency_code":"CAD","in_stock":true},{"title":"7\" \/ Spring Closed","offer_id":43337708797995,"sku":"BDH-0700-000","price":108.0,"currency_code":"CAD","in_stock":true},{"title":"7\" \/ Gravity Closed","offer_id":43337708863531,"sku":"BDH-0700-000-G","price":108.0,"currency_code":"CAD","in_stock":true},{"title":"8\" \/ Spring Closed","offer_id":43337708896299,"sku":"BDH-0800-000","price":113.0,"currency_code":"CAD","in_stock":true},{"title":"8\" \/ Gravity Closed","offer_id":43337708961835,"sku":"BDH-0800-000-G","price":113.0,"currency_code":"CAD","in_stock":true},{"title":"9\" \/ Spring Closed","offer_id":43337708994603,"sku":"BDH-0900-000","price":120.0,"currency_code":"CAD","in_stock":true},{"title":"9\" \/ Gravity Closed","offer_id":43337709060139,"sku":"BDH-0900-000-G","price":120.0,"currency_code":"CAD","in_stock":true},{"title":"10\" \/ Spring Closed","offer_id":43337709092907,"sku":"BDH-1000-000","price":226.0,"currency_code":"CAD","in_stock":true},{"title":"10\" \/ Gravity Closed","offer_id":43337709158443,"sku":"BDH-1000-000-G","price":226.0,"currency_code":"CAD","in_stock":true},{"title":"12\" \/ Spring Closed","offer_id":43337709191211,"sku":"BDH-1200-000","price":245.0,"currency_code":"CAD","in_stock":true},{"title":"12\" \/ Gravity Closed","offer_id":43337709256747,"sku":"BDH-1200-000-G","price":245.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0647\/3459\/3067\/files\/BDH.png?v=1775069364"},{"product_id":"bdd-back-draft-damper-spring-return-4-24in","title":"BDD Back Draft Damper — Spring Return, Any Orientation, Inline or Butterfly, 4\"–24\"","description":"\u003cp\u003e\u003cem\u003eProduct image is representative only. Actual product may differ in appearance depending on size, configuration, and options selected at order.\u003c\/em\u003e\u003c\/p\u003e\n\u003cstyle\u003e\n  .bdd-desc * { box-sizing: border-box; margin: 0; padding: 0; }\n  .bdd-desc { font-family: 'Open Sans', sans-serif; color: #001F3F; line-height: 1.6; font-size: 15px; }\n\n  .bdd-desc__intro { font-size: 15px; line-height: 1.75; color: #374151; margin-bottom: 20px; }\n\n  .bdd-desc__bullets { display: flex; flex-direction: column; gap: 6px; margin-bottom: 20px; }\n  .bdd-desc__bullet { display: flex; align-items: flex-start; gap: 10px; }\n  .bdd-desc__bullet-check { color: #C8102E; font-weight: 700; font-size: 14px; flex-shrink: 0; line-height: 1.6; }\n  .bdd-desc__bullet-text { font-size: 14px; color: #374151; font-family: 'Open Sans', sans-serif; line-height: 1.6; }\n  .bdd-desc__bullet-text strong { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #001F3F; }\n\n  .bdd-desc__warning { background: #fff3f4; border-left: 4px solid #C8102E; border-radius: 0 4px 4px 0; padding: 12px 16px; margin-bottom: 20px; font-size: 13.5px; color: #001F3F; font-family: 'Open Sans', sans-serif; line-height: 1.6; }\n  .bdd-desc__warning strong { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #C8102E; }\n\n  .bdd-desc__note { background: #F3F6F8; border-left: 4px solid #001F3F; border-radius: 0 4px 4px 0; padding: 12px 16px; margin-bottom: 20px; font-size: 13.5px; color: #001F3F; font-family: 'Open Sans', sans-serif; line-height: 1.6; }\n  .bdd-desc__note strong { font-family: 'Montserrat', sans-serif; font-weight: 700; }\n  .bdd-desc__note a { color: #C8102E; text-decoration: none; font-weight: 600; }\n\n  \/* Inline vs Butterfly — primary selection decision *\/\n  .bdd-desc__compare { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 20px; }\n  .bdd-desc__compare-card { background: #F3F6F8; border: 1px solid #e2e8f0; border-radius: 5px; padding: 12px 14px; }\n  .bdd-desc__compare-card--red { border-top: 3px solid #C8102E; }\n  .bdd-desc__compare-card--navy { border-top: 3px solid #001F3F; }\n  .bdd-desc__compare-title { font-family: 'Montserrat', sans-serif; font-size: 13px; font-weight: 800; color: #001F3F; margin-bottom: 8px; }\n  .bdd-desc__compare-item { display: flex; align-items: flex-start; gap: 7px; margin-bottom: 5px; }\n  .bdd-desc__compare-item:last-child { margin-bottom: 0; }\n  .bdd-desc__compare-dot--red { color: #C8102E; font-weight: 700; font-size: 13px; flex-shrink: 0; line-height: 1.5; }\n  .bdd-desc__compare-dot--navy { color: #001F3F; font-weight: 700; font-size: 13px; flex-shrink: 0; line-height: 1.5; }\n  .bdd-desc__compare-text { font-size: 12.5px; color: #374151; font-family: 'Open Sans', sans-serif; line-height: 1.45; }\n\n  \/* Part number quick-ref table *\/\n  .bdd-desc__table-wrap { overflow-x: auto; margin-bottom: 20px; }\n  .bdd-desc__table { width: 100%; border-collapse: collapse; font-size: 12.5px; font-family: 'Open Sans', sans-serif; }\n  .bdd-desc__table th { background: #001F3F; color: #FFFFFF; font-family: 'Montserrat', sans-serif; font-weight: 700; font-size: 10.5px; text-transform: uppercase; letter-spacing: 0.05em; padding: 8px 12px; text-align: left; white-space: nowrap; }\n  .bdd-desc__table td { padding: 7px 12px; border-bottom: 1px solid #e2e8f0; color: #001F3F; vertical-align: top; }\n  .bdd-desc__table tr:last-child td { border-bottom: none; }\n  .bdd-desc__table tr:nth-child(even) td { background: #f8fafc; }\n  .bdd-desc__table td:first-child { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #C8102E; }\n  .bdd-desc__table-note { font-size: 11.5px; color: #718096; font-family: 'Open Sans', sans-serif; margin-top: 6px; font-style: italic; }\n\n  \/* Specs *\/\n  .bdd-desc__specs { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 8px; margin-bottom: 20px; }\n  .bdd-desc__spec { background: #F3F6F8; border: 1px solid #e2e8f0; border-radius: 5px; padding: 10px 12px; }\n  .bdd-desc__spec-label { font-family: 'Montserrat', sans-serif; font-size: 10px; font-weight: 700; text-transform: uppercase; letter-spacing: 0.07em; color: #718096; margin-bottom: 3px; }\n  .bdd-desc__spec-value { font-family: 'Montserrat', sans-serif; font-size: 12.5px; font-weight: 700; color: #001F3F; line-height: 1.35; }\n  .bdd-desc__spec--highlight { background: #001F3F; border-color: #001F3F; }\n  .bdd-desc__spec--highlight .bdd-desc__spec-label { color: rgba(255,255,255,0.5); }\n  .bdd-desc__spec--highlight .bdd-desc__spec-value { color: #FFFFFF; }\n  .bdd-desc__spec--amber { background: #fffbeb; border-color: #d97706; }\n  .bdd-desc__spec--amber .bdd-desc__spec-label { color: #92400e; }\n  .bdd-desc__spec--amber .bdd-desc__spec-value { color: #92400e; }\n\n  .bdd-desc__warranty { display: flex; align-items: center; gap: 10px; background: #001F3F; border-radius: 5px; padding: 12px 16px; }\n  .bdd-desc__warranty-text { font-family: 'Montserrat', sans-serif; font-size: 13px; font-weight: 700; color: #FFFFFF; }\n  .bdd-desc__warranty-sub { font-size: 12px; color: rgba(255,255,255,0.6); font-family: 'Open Sans', sans-serif; margin-top: 2px; }\n\n  @media (max-width: 480px) {\n    .bdd-desc__compare { grid-template-columns: 1fr; }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"bdd-desc\"\u003e\n\u003cp class=\"bdd-desc__intro\"\u003eSpring-return back draft damper for inline duct applications. Allows airflow in the forward direction and closes against reverse airflow — no power, no wiring, no control sequence. Spring closes the blade in any mounting orientation: horizontal, vertical, inverted, or any angle. Standard inline 4\"–24\". Inset butterfly (-B suffix) for retrofit into existing duct openings, 4\"–6\".\u003c\/p\u003e\n\u003cdiv class=\"bdd-desc__bullets\"\u003e\n\u003cdiv class=\"bdd-desc__bullet\"\u003e\n\u003cspan class=\"bdd-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"bdd-desc__bullet-text\"\u003e\u003cstrong\u003eSpring return — any mounting orientation\u003c\/strong\u003e — closes regardless of whether the duct is horizontal, vertical, or angled; gravity-close alternatives require near-horizontal mounting to work correctly\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__bullet\"\u003e\n\u003cspan class=\"bdd-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"bdd-desc__bullet-text\"\u003e\u003cstrong\u003eNo power, no wiring, nothing to fail electrically\u003c\/strong\u003e — passive mechanical operation; spring mechanism and galvanized steel body with a 10-year mechanical warranty\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__bullet\"\u003e\n\u003cspan class=\"bdd-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"bdd-desc__bullet-text\"\u003e\u003cstrong\u003eSecondary seal on HAC fresh air runs\u003c\/strong\u003e — standard practice on HRV\/ERV fresh air duct runs in cold climates; BDD downstream of the motorized HAC provides passive protection on power loss and during HAC blade travel\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__bullet\"\u003e\n\u003cspan class=\"bdd-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"bdd-desc__bullet-text\"\u003e\u003cstrong\u003eButterfly style (-B) for retrofit\u003c\/strong\u003e — insets into existing duct opening without a full inline body; 4\"–6\" only; for retrofit above 6\" install a short inline section with the standard BDD\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__bullet\"\u003e\n\u003cspan class=\"bdd-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"bdd-desc__bullet-text\"\u003e\u003cstrong\u003eConfirm airflow direction before installing\u003c\/strong\u003e — BDD is not bidirectional; an arrow on the body indicates the correct forward flow direction; reverse installation means the spring holds the blade closed against normal airflow\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__warning\"\u003e\n\u003cstrong\u003eNot for at-wall termination applications.\u003c\/strong\u003e The BDD is an inline duct product — it installs inside the duct run between duct sections. For a back draft damper at the building exterior wall use the \u003ca style=\"color: #c8102e; text-decoration: none; font-weight: 600;\" href=\"\/products\/bdh-back-draft-hood\"\u003eBDH Back Draft Hood\u003c\/a\u003e. For adjustable bypass pressure relief on zone systems use the \u003ca style=\"color: #c8102e; text-decoration: none; font-weight: 600;\" href=\"\/products\/hac-bpd-back-pressure-damper\"\u003eHAC-BPD\u003c\/a\u003e.\u003c\/div\u003e\n\u003c!-- Inline vs Butterfly --\u003e\n\u003cdiv class=\"bdd-desc__compare\"\u003e\n\u003cdiv class=\"bdd-desc__compare-card bdd-desc__compare-card--red\"\u003e\n\u003cdiv class=\"bdd-desc__compare-title\"\u003eStandard Inline — use for…\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__compare-item\"\u003e\n\u003cspan class=\"bdd-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"bdd-desc__compare-text\"\u003eNew installations — full duct fitting, installs inline like any round section\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__compare-item\"\u003e\n\u003cspan class=\"bdd-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"bdd-desc__compare-text\"\u003eFull size range 4\"–24\" — the correct choice for 7\" and above\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__compare-item\"\u003e\n\u003cspan class=\"bdd-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"bdd-desc__compare-text\"\u003eAny application where the duct run is being modified or replaced\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__compare-item\"\u003e\n\u003cspan class=\"bdd-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"bdd-desc__compare-text\"\u003eMore reliable installation — full body, standard duct connections\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__compare-card bdd-desc__compare-card--navy\"\u003e\n\u003cdiv class=\"bdd-desc__compare-title\"\u003eButterfly (-B) — use for…\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__compare-item\"\u003e\n\u003cspan class=\"bdd-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"bdd-desc__compare-text\"\u003eRetrofit into existing duct opening — no full inline body required\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__compare-item\"\u003e\n\u003cspan class=\"bdd-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"bdd-desc__compare-text\"\u003e4\"–6\" only — tight spaces where adding a full inline section is impractical\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__compare-item\"\u003e\n\u003cspan class=\"bdd-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"bdd-desc__compare-text\"\u003eExisting duct opening is already correct size — butterfly relies on close fit to seal\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__compare-item\"\u003e\n\u003cspan class=\"bdd-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"bdd-desc__compare-text\"\u003eFor retrofit above 6\": use a short inline section + standard BDD instead\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- Part number quick-ref --\u003e\n\u003cdiv class=\"bdd-desc__table-wrap\"\u003e\n\u003ctable class=\"bdd-desc__table\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eExample\u003c\/th\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003cth\u003eStyle\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e4\" inline\u003c\/td\u003e\n\u003ctd\u003eBDD-0400-000\u003c\/td\u003e\n\u003ctd\u003eStandard inline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6\" inline\u003c\/td\u003e\n\u003ctd\u003eBDD-0600-000\u003c\/td\u003e\n\u003ctd\u003eStandard inline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e6\" butterfly\u003c\/td\u003e\n\u003ctd\u003eBDD-0600-000-B\u003c\/td\u003e\n\u003ctd\u003eInset butterfly — retrofit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e8\" inline\u003c\/td\u003e\n\u003ctd\u003eBDD-0800-000\u003c\/td\u003e\n\u003ctd\u003eStandard inline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e12\" inline\u003c\/td\u003e\n\u003ctd\u003eBDD-1200-000\u003c\/td\u003e\n\u003ctd\u003eStandard inline\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e24\" inline\u003c\/td\u003e\n\u003ctd\u003eBDD-2400-000\u003c\/td\u003e\n\u003ctd\u003eStandard inline — largest standard size\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cdiv class=\"bdd-desc__table-note\"\u003ePart number structure: BDD-[size as 4 digits]-000 for inline; add -B suffix for butterfly. Sizes above 24\" contact factory.\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__specs\"\u003e\n\u003cdiv class=\"bdd-desc__spec bdd-desc__spec--highlight\"\u003e\n\u003cdiv class=\"bdd-desc__spec-label\"\u003eMounting\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__spec-value\"\u003eAny orientation — spring closes\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__spec\"\u003e\n\u003cdiv class=\"bdd-desc__spec-label\"\u003eInline Sizes\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__spec-value\"\u003e4\"–24\" standard\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__spec bdd-desc__spec--amber\"\u003e\n\u003cdiv class=\"bdd-desc__spec-label\"\u003eButterfly Sizes\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__spec-value\"\u003e4\"–6\" only\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__spec\"\u003e\n\u003cdiv class=\"bdd-desc__spec-label\"\u003eOperation\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__spec-value\"\u003eNo power, no wiring\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__spec\"\u003e\n\u003cdiv class=\"bdd-desc__spec-label\"\u003eConstruction\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__spec-value\"\u003eGalvanized steel\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__spec\"\u003e\n\u003cdiv class=\"bdd-desc__spec-label\"\u003eWarranty\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__spec-value\"\u003e10-year mechanical\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__note\"\u003e\n\u003cstrong\u003eNeed position confirmation or actual airflow measurement?\u003c\/strong\u003e The BDD is passive — no end switch, no electrical output. For confirmed blade position on a motorized damper use the \u003ca href=\"\/products\/hac-inline-motorized-air-damper-24vac\"\u003eHAC with end switch option\u003c\/a\u003e. For actual airflow confirmation in the duct run use the \u003ca href=\"\/products\/pfs-positive-flow-switch\"\u003ePFS Positive Flow Switch\u003c\/a\u003e. For a back draft damper at the building wall exterior use the \u003ca href=\"\/products\/bdh-back-draft-hood\"\u003eBDH Back Draft Hood\u003c\/a\u003e.\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__warranty\"\u003e\n\u003csvg style=\"flex-shrink: 0;\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" fill=\"none\" viewbox=\"0 0 24 24\" height=\"20\" width=\"20\"\u003e\n      \u003cpath stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.8\" stroke=\"#C8102E\" d=\"M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z\"\u003e\u003c\/path\u003e\n      \u003cpath stroke-linejoin=\"round\" stroke-linecap=\"round\" stroke-width=\"1.8\" stroke=\"#C8102E\" d=\"M9 12l2 2 4-4\"\u003e\u003c\/path\u003e\n    \u003c\/svg\u003e\n\u003cdiv\u003e\n\u003cdiv class=\"bdd-desc__warranty-text\"\u003e10-year mechanical warranty\u003c\/div\u003e\n\u003cdiv class=\"bdd-desc__warranty-sub\"\u003eMade in Canada  ·  No power, no wiring, nothing to fail electrically\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Hoyme Manufacturing","offers":[{"title":"3\" \/ Single Blade","offer_id":43337745268779,"sku":"BDD-0300-000","price":64.0,"currency_code":"CAD","in_stock":true},{"title":"4\" \/ Single Blade","offer_id":43337745334315,"sku":"BDD-0400-000","price":59.0,"currency_code":"CAD","in_stock":true},{"title":"4\" \/ Butterfly","offer_id":43337745367083,"sku":"BDD-0400-000-B","price":59.0,"currency_code":"CAD","in_stock":true},{"title":"5\" \/ Single Blade","offer_id":43337745399851,"sku":"BDD-0500-000","price":61.0,"currency_code":"CAD","in_stock":true},{"title":"5\" \/ Butterfly","offer_id":43337745432619,"sku":"BDD-0500-000-B","price":61.0,"currency_code":"CAD","in_stock":true},{"title":"6\" \/ Single Blade","offer_id":43337745465387,"sku":"BDD-0600-000","price":62.0,"currency_code":"CAD","in_stock":true},{"title":"6\" \/ Butterfly","offer_id":43337745498155,"sku":"BDD-0600-000-B","price":62.0,"currency_code":"CAD","in_stock":true},{"title":"7\" \/ Single Blade","offer_id":43337745530923,"sku":"BDD-0700-000","price":64.0,"currency_code":"CAD","in_stock":true},{"title":"8\" \/ Single Blade","offer_id":43337745596459,"sku":"BDD-0800-000","price":68.0,"currency_code":"CAD","in_stock":true},{"title":"9\" \/ Single Blade","offer_id":43337745661995,"sku":"BDD-0900-000","price":119.0,"currency_code":"CAD","in_stock":true},{"title":"10\" \/ Single Blade","offer_id":43337745727531,"sku":"BDD-1000-000","price":183.0,"currency_code":"CAD","in_stock":true},{"title":"12\" \/ Single Blade","offer_id":43337745793067,"sku":"BDD-1200-000","price":193.0,"currency_code":"CAD","in_stock":true},{"title":"14\" \/ Single Blade","offer_id":43337745858603,"sku":"BDD-1400-000","price":208.0,"currency_code":"CAD","in_stock":true},{"title":"16\" \/ Single Blade","offer_id":43337745924139,"sku":"BDD-1600-000","price":221.0,"currency_code":"CAD","in_stock":true},{"title":"18\" \/ Single Blade","offer_id":43337745989675,"sku":"BDD-1800-000","price":237.0,"currency_code":"CAD","in_stock":true},{"title":"20\" \/ Single Blade","offer_id":43337746055211,"sku":"BDD-2000-000","price":251.0,"currency_code":"CAD","in_stock":true},{"title":"22\" \/ Single Blade","offer_id":43337746120747,"sku":"BDD-2200-000","price":272.0,"currency_code":"CAD","in_stock":true},{"title":"24\" \/ Single Blade","offer_id":43337746186283,"sku":"BDD-2400-000","price":288.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0647\/3459\/3067\/files\/bdd.png?v=1775067246"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0647\/3459\/3067\/collections\/bdd.png?v=1775506457","url":"https:\/\/www.hoyme.com\/collections\/back-draft-pressure-dampers.oembed","provider":"Hoyme Manufacturing","version":"1.0","type":"link"}