Valcourt 4"Ø Fresh Air Intake Register with Airtight Damper - 8pcs. h13 Close the unit’s door when

Close the unit’s door when you reach a flue temperature of approximately 475 °F on the chimney thermometer

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Valcourt 4"Ø Fresh Air Intake Register with Airtight Damper - 8pcs. h13 Close the unit’s door whenThis device opens and closes the fresh air supply to a wood or pellet heating appliance being certified with a 4" fresh air intake kit. Its simple mechanism makes it possible to close the damper tightly when the heating appliance is not in operation. Documents & Files Owner's Manual