{"product_id":"hac-h-heat-bypass-inline-damper-24vac","title":"HAC-H Heat Inline Damper — CSA Certified, 24 Vac, 2\"–9\", 10% Heat Bypass","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  .hach-desc * { box-sizing: border-box; margin: 0; padding: 0; }\n  .hach-desc { font-family: 'Open Sans', sans-serif; color: #001F3F; line-height: 1.6; font-size: 15px; }\n\n  .hach-desc__intro { font-size: 15px; line-height: 1.75; color: #374151; margin-bottom: 20px; }\n\n  .hach-desc__bullets { display: flex; flex-direction: column; gap: 6px; margin-bottom: 20px; }\n  .hach-desc__bullet { display: flex; align-items: flex-start; gap: 10px; }\n  .hach-desc__bullet-check { color: #C8102E; font-weight: 700; font-size: 14px; flex-shrink: 0; line-height: 1.6; }\n  .hach-desc__bullet-text { font-size: 14px; color: #374151; font-family: 'Open Sans', sans-serif; line-height: 1.6; }\n  .hach-desc__bullet-text strong { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #001F3F; }\n\n  .hach-desc__critical { 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  .hach-desc__critical strong { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #C8102E; }\n\n  .hach-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  .hach-desc__warning strong { font-family: 'Montserrat', sans-serif; font-weight: 700; color: #C8102E; }\n\n  .hach-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  .hach-desc__note strong { font-family: 'Montserrat', sans-serif; font-weight: 700; }\n\n  .hach-desc__compare { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 20px; }\n  .hach-desc__compare-card { background: #F3F6F8; border: 1px solid #e2e8f0; border-radius: 5px; padding: 12px 14px; }\n  .hach-desc__compare-card--red { border-top: 3px solid #C8102E; }\n  .hach-desc__compare-card--navy { border-top: 3px solid #001F3F; }\n  .hach-desc__compare-title { font-family: 'Montserrat', sans-serif; font-size: 12px; font-weight: 700; color: #001F3F; margin-bottom: 8px; }\n  .hach-desc__compare-item { display: flex; align-items: flex-start; gap: 7px; margin-bottom: 5px; }\n  .hach-desc__compare-item:last-child { margin-bottom: 0; }\n  .hach-desc__compare-dot--red { color: #C8102E; font-weight: 700; font-size: 13px; flex-shrink: 0; line-height: 1.5; }\n  .hach-desc__compare-dot--navy { color: #001F3F; font-weight: 700; font-size: 13px; flex-shrink: 0; line-height: 1.5; }\n  .hach-desc__compare-text { font-size: 12.5px; color: #374151; font-family: 'Open Sans', sans-serif; line-height: 1.45; }\n\n  .hach-desc__specs { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 8px; margin-bottom: 20px; }\n  .hach-desc__spec { background: #F3F6F8; border: 1px solid #e2e8f0; border-radius: 5px; padding: 10px 12px; }\n  .hach-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  .hach-desc__spec-value { font-family: 'Montserrat', sans-serif; font-size: 12.5px; font-weight: 700; color: #001F3F; line-height: 1.35; }\n  .hach-desc__spec--red { background: #fff3f4; border-color: #C8102E; }\n  .hach-desc__spec--red .hach-desc__spec-label { color: #C8102E; }\n  .hach-desc__spec--red .hach-desc__spec-value { color: #C8102E; }\n  .hach-desc__spec--highlight { background: #001F3F; border-color: #001F3F; }\n  .hach-desc__spec--highlight .hach-desc__spec-label { color: rgba(255,255,255,0.5); }\n  .hach-desc__spec--highlight .hach-desc__spec-value { color: #FFFFFF; }\n\n  .hach-desc__warranty { display: flex; align-items: center; gap: 10px; background: #001F3F; border-radius: 5px; padding: 12px 16px; }\n  .hach-desc__warranty-text { font-family: 'Montserrat', sans-serif; font-size: 13px; font-weight: 700; color: #FFFFFF; }\n  .hach-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    .hach-desc__compare { grid-template-columns: 1fr; }\n  }\n\u003c\/style\u003e\n\u003cdiv class=\"hach-desc\"\u003e\n\u003cp class=\"hach-desc__intro\"\u003eCSA-certified motorized inline zone damper for hot air supply duct control where full shutoff causes heat buildup, high-limit trips, or thermal stress. A 10% bypass is machined directly into the blade at the factory — permanent, consistent, always present. Same patented Hoyme 24 Vac spring return drive as the standard HAC. Sizes 2\"–9\".\u003c\/p\u003e\n\u003c!-- APPLICATION WARNING — unchanged, confirmed accurate against source --\u003e\n\u003cdiv class=\"hach-desc__critical\"\u003e\n\u003cstrong\u003eNot for fresh air, make-up air, or ventilation applications.\u003c\/strong\u003e The 10% bypass is permanent and cannot be disabled. On a fresh air or outdoor air duct, outdoor air infiltrates the building continuously through the bypass whenever the damper is commanded closed — every hour, every day, every season. If a HAC-H has been installed on a fresh air application in error, it must be replaced with a standard HAC.\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__bullets\"\u003e\n\u003cdiv class=\"hach-desc__bullet\"\u003e\n\u003cspan class=\"hach-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"hach-desc__bullet-text\"\u003e\u003cstrong\u003e10% bypass machined into the blade at the factory\u003c\/strong\u003e — not a field modification, not an adjustable insert, not removable; consistent on every unit\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__bullet\"\u003e\n\u003cspan class=\"hach-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"hach-desc__bullet-text\"\u003e\u003cstrong\u003ePrevents high-limit trips on single-speed furnaces\u003c\/strong\u003e — maintains minimum airflow through closed zones, relieving static pressure and keeping heat exchanger airflow above the trip threshold\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__bullet\"\u003e\n\u003cspan class=\"hach-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"hach-desc__bullet-text\"\u003e\u003cstrong\u003eSame patented Hoyme spring motor drive\u003c\/strong\u003e — stall-protected, holds against elevated duct static pressure on pressurized zone systems without tripping\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__bullet\"\u003e\n\u003cspan class=\"hach-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"hach-desc__bullet-text\"\u003e\u003cstrong\u003eCSA certified — complete assembly\u003c\/strong\u003e — covers Canadian and US installations\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__bullet\"\u003e\n\u003cspan class=\"hach-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"hach-desc__bullet-text\"\u003e\u003cstrong\u003ePO or PC action, end switch and relay available\u003c\/strong\u003e — all factory-installed; relay not available on 2\" and 3\"\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__bullet\"\u003e\n\u003cspan class=\"hach-desc__bullet-check\"\u003e✓\u003c\/span\u003e \u003cspan class=\"hach-desc__bullet-text\"\u003e\u003cstrong\u003eReplacement parts stocked\u003c\/strong\u003e — motor kits, microswitch kits, spring return kits at your wholesaler; drive services in place\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c!-- CORRECTION 1: PO\/PC confirmation warning was absent from the original description.\n       The source document states: \"PO and PC are not interchangeable. Action cannot be\n       changed after installation. Confirm action before placing the order.\" All other HAC\n       family descriptions carry this warning. Added here with the session-consistent\n       softened language (field conversion requires drive disassembly, not practical in\n       a duct run). --\u003e\n\u003cdiv class=\"hach-desc__warning\"\u003e\n\u003cstrong\u003eConfirm PO vs. PC before ordering.\u003c\/strong\u003e The action is set at the factory. A field conversion procedure exists — it requires removing the motor, reversing the spring plate, and remounting the drive — but this is not practical once the unit is installed in a duct run. For most hot air zone control applications PO is correct — the zone opens when called and spring-closes when the call ends. PC is used only when the zone must fail open on power loss; confirm with the system designer before specifying PC on a zone damper.\u003c\/div\u003e\n\u003c!-- CORRECTION 2: Variable speed furnace row moved out of \"Use standard HAC when...\"\n       and into its own neutral row in the HAC-H column.\n       Original placed it only under standard HAC, implying the HAC-H is never correct\n       for variable speed. Source says: \"Variable speed furnace: HAC or HAC-H — Variable\n       speed modulates down — bypass may still be preferred; confirm with system designer.\"\n       Both products are valid; the correct choice depends on the system designer. --\u003e\n\u003cdiv class=\"hach-desc__compare\"\u003e\n\u003cdiv class=\"hach-desc__compare-card hach-desc__compare-card--red\"\u003e\n\u003cdiv class=\"hach-desc__compare-title\"\u003eUse HAC-H when…\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__compare-item\"\u003e\n\u003cspan class=\"hach-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"hach-desc__compare-text\"\u003eHot air supply duct zone control — single-speed furnace\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__compare-item\"\u003e\n\u003cspan class=\"hach-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"hach-desc__compare-text\"\u003eClosing supply zones causes high-limit trips or heat buildup\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__compare-item\"\u003e\n\u003cspan class=\"hach-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"hach-desc__compare-text\"\u003eMinimum airflow through all zones required regardless of call status\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__compare-item\"\u003e\n\u003cspan class=\"hach-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"hach-desc__compare-text\"\u003eVariable speed furnace — bypass may still be preferred; confirm with system designer\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__compare-item\"\u003e\n\u003cspan class=\"hach-desc__compare-dot--red\"\u003e✓\u003c\/span\u003e\u003cspan class=\"hach-desc__compare-text\"\u003e120 Vac site — see HAC-12H\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__compare-card hach-desc__compare-card--navy\"\u003e\n\u003cdiv class=\"hach-desc__compare-title\"\u003eUse standard HAC when…\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__compare-item\"\u003e\n\u003cspan class=\"hach-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"hach-desc__compare-text\"\u003eFresh air intake, make-up air, or ventilation — full shutoff required\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__compare-item\"\u003e\n\u003cspan class=\"hach-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"hach-desc__compare-text\"\u003eReturn air zone control — bypass not required on return side\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__compare-item\"\u003e\n\u003cspan class=\"hach-desc__compare-dot--navy\"\u003e→\u003c\/span\u003e\u003cspan class=\"hach-desc__compare-text\"\u003eHRV \/ ERV duct control — bypass allows reverse infiltration\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__specs\"\u003e\n\u003cdiv class=\"hach-desc__spec hach-desc__spec--highlight\"\u003e\n\u003cdiv class=\"hach-desc__spec-label\"\u003eBypass\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__spec-value\"\u003e10% — factory machined, permanent\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__spec\"\u003e\n\u003cdiv class=\"hach-desc__spec-label\"\u003eSizes\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__spec-value\"\u003e2\"–9\"\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__spec\"\u003e\n\u003cdiv class=\"hach-desc__spec-label\"\u003eVoltage\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__spec-value\"\u003e24 Vac\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__spec\"\u003e\n\u003cdiv class=\"hach-desc__spec-label\"\u003eAction\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__spec-value\"\u003ePO or PC\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__spec\"\u003e\n\u003cdiv class=\"hach-desc__spec-label\"\u003eCertification\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__spec-value\"\u003eCSA — complete assembly\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__spec hach-desc__spec--red\"\u003e\n\u003cdiv class=\"hach-desc__spec-label\"\u003eNot Suitable For\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__spec-value\"\u003eFresh air, make-up air, ventilation\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__note\"\u003e\n\u003cstrong\u003e120 Vac site?\u003c\/strong\u003e The HAC-12H combines the 120 Vac built-in transformer with the same 10% bypass blade. Use HAC-12H when only 120 Vac is available at the damper location and hot air zone control with bypass is required.\u003c\/div\u003e\n\u003cdiv class=\"hach-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=\"hach-desc__warranty-text\"\u003e2-year electrical · 10-year mechanical warranty\u003c\/div\u003e\n\u003cdiv class=\"hach-desc__warranty-sub\"\u003eMade in Canada · CSA certified for Canadian and US installations\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Hoyme Manufacturing","offers":[{"title":"2\" \/ Power Open (PO) \/ Standard (No Relay \/ No End Switch)","offer_id":43081011888171,"sku":"HAC-0210-OPO-H","price":228.0,"currency_code":"CAD","in_stock":true},{"title":"2\" \/ Power Open (PO) \/ End Switch (No Relay)","offer_id":43081011920939,"sku":"HAC-0210-SPO-H","price":256.0,"currency_code":"CAD","in_stock":true},{"title":"2\" \/ Power Close (PC) \/ Standard (No Relay \/ No End Switch)","offer_id":43081012019243,"sku":"HAC-0210-OPC-H","price":228.0,"currency_code":"CAD","in_stock":true},{"title":"2\" \/ Power Close (PC) \/ End Switch (No Relay)","offer_id":43081012052011,"sku":"HAC-0210-SPC-H","price":256.0,"currency_code":"CAD","in_stock":true},{"title":"3\" \/ Power Open (PO) \/ Standard (No Relay \/ No End Switch)","offer_id":43081012150315,"sku":"HAC-0310-OPO-H","price":228.0,"currency_code":"CAD","in_stock":true},{"title":"3\" \/ 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