Answer / mm

Id fan maintains the pressure equillibrium inside the
furnace by providing slightly negative pressure inside the
furnace, so that the gases are let out of the furnace to
the chimney. If the chimney height is more, it may not be
adequate to evacuate the gases in the furnace. Hence Id fan
acts as a booster to maintain draft in the furnace, though
some may be of the opinion that Id fan acts as a sucker of
the gases generated in the furnace thus avoiding explosive
gases to be let into the environment.

Answer / vinayak

It maintains the pressure equillibrium inside the
furnace so that the gases are let out of the furnace to
the chimney. And complete combustion of the fuel

Answer / mani tyagi

id fans is used in furnace to control air pollution.

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