The furnace fan's job is blowing hot air through the duct work to be dispersed in your house. Turning the fan on or off to distribute heat is as simple as turning the heat up on your thermostat. However, turning the fan on without turning the heat up is an option as well. This is especially useful in keeping the bathroom steam free while showering. The way to turn on the fan depends on the model of thermostat you have.
Look under the thermostat for a sliding tab or on the thermostat's face for a fan button.
Slide the fan tab to the on position. This turns on the thermostat fan, which will run until the tab is pushed back to the auto position.
Push the fan button if there is no sliding tab. Look on the thermostat's face. If you see "Fan ON," this means the fan is running continuously until you push the fan button again.
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