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, ...
Q: I’m confused about maintenance of my crawlspace, which also serves as a cold-air return plenum for an oil furnace. No cold-air return ducts, just crawlspace. The crawlspace looks quite dirty, and ...
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