Exhaust fan is only use for exhaust the old air, while ventilation fan is use for both purpose intake and exhaust.
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Fan is the thing that makes air to the cooling metal things, the ones that carrys the water. Exhaust is the thing it puts out all the noise.
A fan is used
No
Induction motor
A large ventilation fan was being repaired at a nuclear power plant. The fan was setup in a work area on the turbine deck. The protective screening had been removed. A health physics technician was surveying the fan for radioactive contamination when, due to a failure in communication, the fan was energized. The technician was sucked into the fan and killed.