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, ...
The Family Handyman on MSN
Understanding the different parts of a furnace
Your furnace's job is keeping you warm. Get to know the parts of a furnace so it will do that job better and last a lot ...
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