{"product_id":"hac-bpd-back-pressure-relief-damper","title":"HAC-BPD Back Pressure Damper, Automatic Pressure Relief, No Power Required, 4\"–20\"","description":"\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, and 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\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\n\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; 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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; 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