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Engineering ToolBox > Belt driven Fans - Motor and Fan Speed

Speed of Fan versus Speed of Motor with Belt Drives

Belt driven fans are common in heating, ventilation and cooling systems.

The speed of a belt driven fan versus the speed of the motor can be calculated as

d_f n_f = d_m n_m

where

d_f = pulley diameter fan (inch, mm)

n_f = speed of fan (rpm - rounds per minute)

d_m = pulley diameter motor (inch, mm)

n_m = speed of fan (rpm - rounds per minute)