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What Are ID Fans?
Induced draft fans or ID fans are used in systems such as steam boilers and thermal oil heaters to draw out and remove flue gases from combustion chambers, by creating a vacuum of negative air pressure (typically -10 mm Hg).
How ID Fan Works?
Induced draft fan is normally located at the outlet between dust collector and chimney. The fan takes hot flue gases from the boiler through dust collector and delivers it to the chimney into the open atmosphere. ID fan creates negative pressure or suction to discharge the gases out after combustion from the furnace.
ID FAN
What Are ID Fans Used In?
An ID fan removes flue gases from a boiler and forces exhaust gas up a stack. Nearly every ID furnace operates with a slightly negative pressure. Forced draft (FD) is achieved by forcing air into a furnace with a special fan and ductwork. Often, air is heated prior to entering a boiler to increase overall efficiency.
Difference Between FD Fan And ID Fan:
The key difference between a forced draft and an induced draft fan is, FD fan forces outside air into the heating system whereas an ID fan draws flue gases from the system out into the atmosphere. ... ID fan creates a negative pressure or suction to discharge the gases out after combustion from the furnace.
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