The object) aimed at in the improvements, is to obtain as much caloric as possible from the furnace ... air passes, and by fixing outside the same air chambers or drums, through which the hot ...

Furnaces accomplish this by burning fuel internally to warm air, water or steam, then directing this warmth into various parts of a building to maintain a comfortable indoor temperature.

If your furnace always blows air, sometimes hot and sometimes cold, then it’s likely a fan setting issue. This is more common ...

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