Indoor Forced Air Wood Furnace

Generally, homes are heated with the central forced-air heating systems. Ductwork carries air to the furnace, where the air is filtered, warmed and blown back through ducts to rooms throughout the house.

Furnaces can be fueled by natural gas, oil, propane, coal, wood or electricity. Today, most use gas because it is clean-burning, commonly available and relatively inexpensive. In a few regions, where electricity is unusually affordable, in such areas, electric furnaces or electric radiant-heating may be sensible.

The most important advantage of a forced-air system is that it can include air-conditioning unit, humidifier and air filter. In this furnace, the gas forced-air heating system comes into action when the room's air temperature goes below a preset level on the thermostat. The pilot light lits a burner in the furnace's heat exchanger, a metal chamber around which air flows and is then heated. The warmed air then moves into the hot-air plenum and into the rooms through ducts. The combustion gases are vented through a flue in the roof or in some newer homes, through a wall.

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