combustion air duct

Combustion Air Ducts, Part III: A Direct Connection to the Return Plenum

A combustion air duct connected directly to the furnace return plenum is an undesirable setup, for a number of reasons.
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Combustion Air Ducts, Part II: Problems and Solutions

By far, the most common problem that occurs with combustion air ducts is that they get blocked. When a combustion air duct is blocked, air needs to leak in to...
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Combustion Air Ducts, Part I: Why Houses Need Them

Homeowners, builders, and insulation contractors spend lots of time trying to seal up every little air leak in to a house, but then the building code requires this big hole...
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