What is the difference between the HAC and the HAC-L?

The HAC-L is the cold-climate version of the standard HAC inline damper. The damper body carries factory insulation — applied before assembly, not wrapped in the field — reducing condensation risk and heat loss at the damper location. Everything else is identical: the same 24Vac spring return drive, the same CSA-certified assembly, the same PO/PC configuration, the same end switch and relay options.

Why not just field-wrap a standard HAC with foam insulation?

Field-wrapping misses the thermal bridges that matter most — the actuator housing, motor lead exits, end switch wiring penetrations, and collar-to-duct joint edges. Those are the cold metal surfaces where condensation forms first. Factory insulation is applied before assembly and covers those surfaces as part of the product geometry. On a cold climate installation that will see twenty years of freeze-thaw cycling, factory insulation holds up. Field-wrapped foam tape delaminates, compresses, and gaps over time.

Does the HAC-L replace duct insulation on the fresh air run?

No. The HAC-L insulates the damper body — the metal housing, blade assembly, and actuator mounting area. The duct run from the exterior penetration to the HAC-L still needs to be insulated per code and application requirements. The HAC-L solves the damper-location condensation problem. Insulating the duct run solves the duct-level problem. Both are required on a cold climate fresh air installation.

Is there a 120Vac version of the HAC-L?

Yes — the HAC-12L combines the 120Vac built-in transformer with the factory-insulated body. Use HAC-12L when only 120Vac is available at the damper location and insulation is required.

When is the standard HAC sufficient — when does the job actually require the HAC-L?

The standard HAC is sufficient when the damper is in conditioned mechanical space where ambient temperature stays above the dewpoint of the indoor air year-round. The HAC-L is required when the damper location will be exposed to temperatures low enough to cause condensation on the metal body — typically any location in unconditioned space on a Canadian or northern US installation where outdoor temperatures regularly go below -10°C. When in doubt, specify the HAC-L.

HAC-L Insulated Fresh Air Damper, 24V, CSA, 2 to 9 in.

Hoyme HAC-L insulated inline motorized damper for cold climates

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Factory-insulated motorized inline fresh air damper for cold climate installations: unconditioned spaces, crawlspaces, or any location where the damper body is exposed to temperatures that cause condensation. Same stall-protected Hoyme drive as the standard HAC. CSA certified. Sizes 2"–9".

✓ Factory insulation: applied before assembly. Covers the actuator housing, motor lead exits, and collar joint where field-wrapping fails first

✓ Same drive as standard HAC: Hoyme 24 Vac spring return, stall-protected, nylon bearings, Canada/USA CSA certified

✓ PO or PC action: confirm before ordering; the action can be converted in the field using the Hoyme conversion procedure

✓ End switch and relay available: same options as standard HAC; relay not available on 2" and 3"

✓ Replacement parts stocked: motor kits, microswitch kits, spring return kits at your wholesaler

The HAC-L insulates the damper body only. The duct run from the exterior penetration to the HAC-L still requires insulation per code. If the damper is in conditioned mechanical space with no condensation risk, the standard HAC is sufficient and less expensive.

Insulation

Factory, not field-wrapped

Sizes

2"–9"

Voltage

24 Vac

Action

PO or PC

Certification

Canada/USA CSA

120 Vac version

See HAC-12L

Interlocking with the furnace fan? Use the ADP-0241-05A (24 Vac ventilation switch) or ADP-1101-05A (120 Vac exhaust fan switch) with an OPO or OPC variant; both open the damper and start the furnace fan together. Where an exhaust fan must wait until the damper proves open, use a TPX proving adaptor with the SPO or SPC variant. See the ADP series for the correct model for your application.

2-year electrical · 10-year mechanical warranty

Made in Canada · Built for Canadian winters

Product image is representative only. Actual product may differ in appearance depending on size, configuration, and options selected at order.

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HAC-L Insulated Inline Fresh Air Damper, CSA Certified, 24 Vac, 2"–9", Factory-Insulated Body

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HAC-L Insulated Inline Fresh Air Damper, CSA Certified, 24 Vac, 2"–9", Factory-Insulated Body

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