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The furnace is part of an HVAC or central heating system used to generate heat. Typically this is done with gas, a heat pump, or an electric element. For hot water and radiator based heating, use the boiler tag.

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where the fresh air comes from in garage with gas furnace and heater?

However, I checked my furnace and heater I didn't see any fresh air supply around.... They seems just get fresh air from the garage. …
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