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Length and speed of belt
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Belt driven fans are common in heating, ventilation and cooling systems. The length of the belt can be calculated as
lB = ((dF + dM) 1.5708 ) + (2 lFM) (1)
where
lB = length of belt (inches)
dF = pulley diameter fan (inches)
dM = pulley diameter motor (inches)
lFM = center to center distance of fan and motor pulleys (inches)
The velocity at which a belt travels may be expressed as
v = π dm wm / 12 (2)
where
v = velocity of belt (ft/min)
wm = velocity motor (rpm)
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