Most noncondensing residential furnaces use natural draft to drive the combustion process. Even 80%-AFUE furnaces with combustion blowers are natural-draft furnaces. The combustion blower in an 80% ...
The Cool Down on MSN
Homeowner swaps old furnace, then learns open water-heater flue should have been capped
"You will have a lot of cold air coming down the chimney, or hot air going out." ...
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