Brand New in the Box! Field Controls GVD-7PL 7" Automatic Vent Damper for 24v Gas Systems Utica-Dunkirk 240006939 Field Controls Part No. 46539207 GVD-7 Automatic Gas Vent Damper 7" Diameter 24V Dual safety switches allow the burner to fire only when the damper is in the open position. This unit will not interfere with existing appliance safety controls, when properly installed. Operates with all 24 VAC, 60hz intermittent ignition and standing pilot ignition systems. Stainless steel construction provides superior corrosion resistance. Damper operation: power opens in 15 seconds, power closes in 15 seconds. Power is off at damper motor when it is at rest. Hold open switch allows damper to be placed in an open position and taken out of service to assist with trouble shooting appliance problems. Keyed wiring harness connector plug installs only one way, preventing incorrect wiring connection. Specifications Diameter (Inches): 7" Width: 11-7/8" Length: 7-1/16" Application: Air Quality Voltage: ? 24v Clearance: 1-7/16" Exposed Pipe: 5-13/16" Motor Timing: 15 Seconds Power Closed 15 Seconds Power Open Shape: Round GREAT ITEM AT A GREAT PRICE!!