When the combustion air duct is connected directly to the return plenum for a furnace, the blower fan on the furnace pulls outdoor air in to the return plenum. To supply this air to the furnace room, ...
How do you fit in not only an upflow furnace, but also the larger 13 SEER or higher A coils and other equipment in an installation? That was the dilemma that Karl Skog, owner, Crosslake Sheetmetal, ...
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