Air King’s MD624 motorized damper mounts inline with the ducting to Air King’s QFAM or FAS fresh air intake units. The lead wires from the motorized damper connect to the included transformer that easily plugs into the receptacle inside the units. The single blade damper with an internal gasket tightly closes off ducting to minimize air leakage. When the QFAM/FAS is energized, the damper automatically opens, then tightly closes when the main unit shuts off. The transformer and lead wires are included with the unit. An Air King model QMDB (sold separately) is required for connection to QFAM models.
A fresh air intake unit functions differently than an exhaust fan in that air is coming into the home rather than going out. Because of that, traditional backdraft dampers used on exhaust fans will not work as they would block off the air that you are trying to bring in. That is where a motorized damper comes into play. When a fresh air unit is not operating, you basically have a 6 inch path for outside air to penetrate into the home. A motorized damper seals that opening and prevents unwanted air from getting into the home.
|Specification Sheet Download||MD624|
|Damper||Single blade with internal gasket|
|Lead Wires||22 AWG, 12 inches|
|Connections||24 volt transformer|
|Use With||QFAMD, F130D|
|Power||24VAC, 60hz, 6 watts|
Motorized Damper with internal gasket
24 volt transformer
QMDB Motorized Damper Relay Box
Allows the MD624 to be plugged into an Air King QFAMD
Includes required wire harness