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In a normal house furnace a fan forces air through an exchanger. This usually consists of some pipes or tubes. A fire on the outside of the tubes heats the air inside the tubes as it passes. The force of the fan also pushes the air along duct work and the warmed air comes out floor vents or regesters. The suction of the fan draws air from through out the house through the larger wall mounted cold air vents. The air passes through a filter and then into the fan where it is then sent to the exchanger. The thermostat that you set for the desired temperature measures the room temperature. When the temperature falls below the set point the thermostat sends a signal to the furnace to start the fan and then turn on the flame. When the temperature at the thermostat rises above set point the signal to the furnace is shut down, the fire goes out and the fan stops.

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