14 Inch Motorized Damper

14 Inch Motorized Damper 24 or 120 Volt

The MD Series Motorized Dampers come in either 24 or 120 Volt, normally closed models. The 120 Volt model is supplied with an end switch rated for a 10-amp load.  The end switch permits sequencing of operation for a remote fan after damper is opened, enabling use of remote fans to ventilate selectively individual bathrooms, laundry rooms and kitchens.

These motorized dampers can also be used to control the sequencing of outside makeup or fresh air in forced air handling systems.

Possible controls for use with zoned ventilation systems include: manual spring wound time delay, electronic time delay, cycle timer, programmable timers, occupancy and humidity sensing switches.

Flow Control Adjustment:

• MINIMUM FLOW ADJUSTMENT: Minimum airflow can be set by loosening the bolt on the shaft and turning the damper from the fully closed position to leave a gap between the gasket and the damper blade. Re-tighten the bolt with the damper at the desired opening.
• MAXIMUM FLOW ADJUSTMENT (Available only on models without end  switch) Maximum airflow can be set by loosening the flow control adjustment bolt. When set , this bolt acts as a stop, limiting the opening of the damper blade. It is preset at the factory to open fully. To adjust, loosen the bolt lock nut, turn the adjusting bolt to the desired setting, and re-tighten the bolt lock nut. Activate the motor after each adjustment to properly reset the motor and damper blade

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