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Tight enough so the drive sheave does not slip and the motor draws the correct amperage, but not so tight that the squirrel cage bearings are damaged. There is a belt tensioning measurement to use but you need the distance between the pulleys to use it properly. Try Google. -END An old rule of thumb is you should have about a half inch of deflection when pressed at the center with your finger. Works with most drive belts

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Q: How tight should the fan belt on an old furnace be?
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