ID Fan and FD Fan Difference

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ID is "Induced Draft" and FD is "Forced Draft."  In an induced draft system, the fan is at the exit end of the path of flow, and the system is under negative pressure - that is, the pressure in the flow area is below atmospheric, because the air is being drawn through the fan.  In a forced draft system the fan is at the entry end of the path of flow.  It operates at positive pressure because outside air is drawn into the fan and forced into the system.

Some burners use a forced-draft system rather than an induced-draft system. The difference here is that the forced draft system

pushes

combustion air into the com-bustion chamber, all the way through the furnace, and out the vent. The induced-draft fan pulls things through the furnace and then pushes them out the vent.

The advantage of the forced-draft fan is that the fan itself is not in the high temperature, acidic environment of the exhaust gases. The forced-draft fan only sees room air. It lives in a much friendlier environment and, therefore, may be less susceptible to failures. Induced-draft fans are one of the most common items to fail on high-efficiency furnaces. 

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