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. (Sharma, 2024)
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« Back to Glossary Index
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. (Sharma, 2024)
« Back to Glossary Index