attic fan suction strength


Old 04-10-13, 07:21 PM
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attic fan suction strength

I replaced a broken belt for my attic fan and ran it for the first time this spring, but the suction doesn't seem to be as strong as it was last year. The belt fits and matched the size of the broken one. Would the belt have anything to do with it, or is there something else I should look into?
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Old 04-10-13, 10:15 PM
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Welcome to the forums.

Funny to see this post. I fired up my 48" attic fan Tuesday night and the outside louvers were stuck shut. I lubricated the shutters and they operate smooth now. It was good timing anyway as the belt was pretty stretched.

Is this a wall mounted exhaust fan in an attic ?
Does it have louvers and are they working correctly ?

If the belt weren't tight enough you would see it flopping around. There should be minimal (1-2") deflection in the belt midway between the fan pulley and the motor pulley.
Old 04-11-13, 10:21 AM
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A slipping belt doesn't always squeal, especially if it's bottoming out in a worn pulley. I'd check the tension as PJMax suggests, and also use a straightedge to make sure the sides of the Vees in the pulleys are straight and not dished with wear.
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