Selection of the proper fan

Selection of the proper fan can be complicated and should be done by a ventilation or fan expert. However, you can make the following observations to determine if the fan selected is appropriate:

Material handled through the fan

If the exhaust air contains a small amount of smoke or dust, a backward inclined centrifugal or axial fan should be selected.If the exhaust air contains light dust, fume or moisture, a backward inclined or radial centrifugal fan would be preferred.If the particulate load in the exhaust air is high or when material is handled, the normal selection would be a radial centrifugal fan.If the exhaust air contains explosive or flammable material, spark resistant construction (explosion proof motor if the motor is in the air stream) should be selected to conform to the standards of the National Fire Protection Association and provincial governmental regulations.If the exhaust air contains corrosive contaminants, a protective coating or special materials of construction (stainless, fibreglass, etc.) may have to be used in construction of the fan and motor.