induced draft fan is larger in size than forced draft fan
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ID fan is basically mentioned here for Induced draft fan and ID fan is always located between dust collector and chimney. ID fan will take the hot flue gases from furnace via dust collector (dust separation system or Fume Extraction system) and will deliver to chimney. ID fan will handle the flue gases i.e. hot air.
ID fan will produce the pressure lower than the atmospheric pressure in the system or we may say that ID fan will produce the negative pressure in the furnace to remove the flue gases from furnace via electrostatic precipitators and to push the flue gases to chimney.
Do not get confused about the dust collector system. Dust collector system also designated as fume extraction system or dust separation system. Somewhere we also used to electrostatic precipitators in place of dust collector system for removing dust particle from flue gases for maintaining the clean environment.
FD Fan
FD fan, which is mentioned here for forced draft fan, is used basically for providing the required quantity of hot air to the furnace for smooth and uniform combustion of fuel. FD fan will produce the positive pressure inside the system i.e. furnace.


Moreover,
FORCE DRAFT:-
Inlet to air preheaterHandle cold airLess maintenance , consume less power as density of cold air is less.
INDUCED DRAFT:-
Locate at foot of stackHandle hot gas, hence more power is requiredCope with corrosive combustion products and fly ash
ID fan will produce the pressure lower than the atmospheric pressure in the system or we may say that ID fan will produce the negative pressure in the furnace to remove the flue gases from furnace via electrostatic precipitators and to push the flue gases to chimney.
Do not get confused about the dust collector system. Dust collector system also designated as fume extraction system or dust separation system. Somewhere we also used to electrostatic precipitators in place of dust collector system for removing dust particle from flue gases for maintaining the clean environment.
FD Fan
FD fan, which is mentioned here for forced draft fan, is used basically for providing the required quantity of hot air to the furnace for smooth and uniform combustion of fuel. FD fan will produce the positive pressure inside the system i.e. furnace.


Moreover,
FORCE DRAFT:-
Inlet to air preheaterHandle cold airLess maintenance , consume less power as density of cold air is less.
INDUCED DRAFT:-
Locate at foot of stackHandle hot gas, hence more power is requiredCope with corrosive combustion products and fly ash
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