what is hot air furnace
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Answer:
mostly used in Aluminium
Explanation:
a heating unit enclosed in a casing from which warm air is circulated through the building in ducts by gravity convection or by fans
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Furnaces. ... A furnace works by blowing heated air through ducts that deliver the warm air to rooms throughout the house via air registers or grills. This type of heating system is called a ducted warm-air or forced warm-air distribution system. It can be powered by electricity, natural gas, or fuel oil.
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