Apply power (24 volts AC at 500mA) to these dampers and they close, shutting off all airflow. Apply power to normally closed dampers and they open. Remove power and a spring returns the dampers to their original position. When used with the multi-zone control panel, simply run 2-conductor wire (18-22-gauge) from the control panel to the damper. It will open or close the dampers to maintain the desired temperature. Control the dampers manually (in single-zone system) by using a switch to apply/remove power to the damper.

These measurments are for both the NO and the NC dampers.
The 6" damper is 7 5/8" tall
The 8" damper is 9 5/8" tall
The 10" damper is 11 1/4" tall
The 12" damper is 13 1/4" tall
The 14" damper is 15 1/8" tall
The 16" damper is 17" tall

Current Consumption: .50 amps

Normally closed dampers: Apply power to open duct, remove power and a spring closes it. Use as sub-zone without any HVAC controller. Do not use with Zone Controllers.

Normally open dampers: Apply power to close duct, remove power and a spring opens it. Use with zone controllers.