An automatic door located in the flue that closes it off when the burner turns off; purpose is to reduce heat loss up the flue from the still-warm furnace or boiler.
Example:
The flue damper was stuck open and needed to be repaired.
FLUE DAMPER
An automatic door located in the flue that closes it off when the burner turns off; purpose is to reduce heat loss up the flue from the still-warm furnace or boiler.
Example:
The flue damper was stuck open and needed to be repaired.