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% ...
Water is a byproduct of combustion. If the proper venting of flue gases is neglected — as is so often the case, unfortunately, in our industry — water in the form of condensation triggers serious ...
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