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A home furnace is a major appliance that is permanently installed to provide heat to an interior space through intermediary fluid movement, which may be air, steam, or hot water. The most common fuel source for modern combustion furnaces in the United States is natural gas; other common fuel sources include propane (LP), fuel oil, coal or wood. In some cases electric resistance heating is used as the source of heat, especially where the cost of electricity is low. Combustion furnaces always need to be vented to the outside. Traditionally, this is through a flue, which expels heat along with the exhaust.

 

 

 

 

 

 

 

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