Induced Draft Fan Vs Forced Draft Fan

Id fan is basically mentioned here for induced draft fan and id fan is always located between dust collector and chimney.

Induced draft fan vs forced draft fan.

The bearing and shaft system is same as belt drive blowers just a couple attached to the combination for shaft end and motor shaft. The forced draft fan only sees room air. It lives in a much friendlier environment and therefore may be less susceptible. In theory the primary advantage of the forced draft unit is that less power is required.

Both axial and centrifugal fans can be used. Typically the fd fans control airflow. All motor coupled industrial blowers fans are supplied with suitable couple set as per blower capacity. Id fan will handle the flue gases i e.

Couple drive induced draft id fans and forced draft f d fans. Almeco s cooling tower range contains all different types. Forced draft means an exhaust fan placed at the base of the cooling tower which then causes overpressure. Forced draft fd fans supplying air to the furnace and induced draft id fans removing flue gas.

Industrial induced draft fans operate by focusing the pressure and volume at the inlet of the fan to pull air through a system. The advantage of the forced draft fan is that the fan itself is not in the high temperature acidic environment of the exhaust gases. To provide redundancy in case a mechanical unit falls and to provide the basic control achievable by running one fan or two a bundle or set of. Air is pulled across the finned tube surface.

Induced draft implies an inlet fan placed on top of the cooling tower and the creation of low pressure. In a balanced draft boiler you actually have both. Forced draft fans focus the pressure and volume at the outlet of the fan to push air through a system creating positive air pressure. Before they were applied to air cooled units induced or forced draft fans were applied to boilers for furnishing combustion air and they still are to this day.

The induced draft fan pulls things through the furnace and then pushes them out the vent. Fans are located above the bundle. They will probably always be optional methods for boiler combustion air source. This is true when the air temperature rise exceeds 54 f 30 c because the fan is pumping denser air.

I ve used the combustion air fan on boilers both ways induced or forced. Axial fans are always used for this type of draft. It s not always either or.