Motorized Dampers

Hoyme has designed and built motorized dampers in Camrose, Alberta since 1984. Every damper here is a complete assembly: body, blade and actuator, ready to wire. Choose by what the air is for, then by duct size and voltage.

Motorized dampers by application

• Fresh air, make-up air and HRV/ERV ducts: the HAC inline series, 2 to 9 in., 24 Vac, CSA certified. Use the HAC-12 where only 120 Vac is available at the damper.
• Combustion air for furnaces, boilers and water heaters: the HOM combustion air damper, 4 to 9 in., CSA certified. The appliance cannot fire until the damper proves open.
• Flue and vent: the HAC-F motorized flue damper, which springs open on power loss. CSA certified up to 12 in.
• Zone control: HAC-H zone dampers with a 10% heat bypass blade to prevent high-limit trips on single-speed furnaces.
• Exterior wall terminations: the MAC and MOH motorized hoods combine the damper and the wall hood in one unit.
• Large duct and commercial: large diameter dampers from 6 to 30 in. with quarter-turn and Belimo actuators, and custom rectangular dampers built to your dimensions.
• BAS and DDC control: modulating and floating point dampers with Belimo actuators, 2 to 10 VDC or 3-wire.

Power open or power close

Every spring return damper is either power open (PO), which springs closed on power loss, or power close (PC), which springs open. Fresh air and HRV ducts are almost always power open. Flue and combustion air applications fail open. See the power open vs power close guide before you order.

Interlocks and wiring

Where a damper has to interlock with an exhaust fan, the furnace fan, a gas dryer or a non-24 Vac safety circuit, pair it with an ADP relay adaptor. Colour wiring diagrams for every configuration are in the Technical Library.

Not sure which damper fits the job? Call technical support at 1-800-661-7382, free for contractors and installers. Hoyme dampers are stocked at HVAC wholesalers across Canada, or order direct here.