Answer Posted / m talha aziz(cap)

In a balanced draft boiler you actually have both F.d fan and I.D fan.
1. I.D stands for Induced draft Fan whereas F.D stands for Force Draft fan.
2. ID fan(Induced Draft Fan)basically pulls out flue gas from
the furnace of boiler. FD fan(Forced Draft Fan)supplies the
required air into the furnace for combustion of fuel.
3. It is located between dust precipitators(ESPs) and Chimney. Obviously it handles hot air/dust. F.D handles air at normal temperature. The capacity/power rating of ID fan will be more than that of FD fan.

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