The field vent damper works automatically to allow natural draft during appliance operation while preventing residual appliance heat and conditioned air from escaping during off cycles. It also prevents the infiltration of cold air during down drafts. It's made of stainless steel and is available in 8 sizes, 4" through 10" and 12".

Field Controls Gas Vent Damper, GVD-7PL Model, 7 in Pipe Size, 24 VAC, 3 W, 7-1/16 in L x 11-7/8 in H, 1-7/16 in Clearance, 5-13/16 in Exposed Pipe

• Prevents the infiltration of cold air during down drafts
• Dual safety switches allow the burner to fire only when the damper is in the open position
• Operation - power opens in 15 sec, power closes in 15 sec, 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