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Thread: exhaust fans

  1. #1
    Join Date
    Feb 2007
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    exhaust fans

    recently found 3/4 hp motor with bad cap. got going. than found another with bad cap. same motor same age of motor, they were both replaced w/i 4 month. im wondering if the wrong size motors were used. fan is a vent pak style serving a chemical hood, belt driven.

  2. #2
    Join Date
    Jun 2001
    San Diego, CA
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    were the motors amped out ok? do they operate in extreme conditions?
    Are the belts usually too tight, properly aligned? These are the chief reasons a motor dies

  3. #3
    Join Date
    Aug 2006
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    Probably the wrong motors. Motors for PRVs have an 1.15 to 1.25 service factor, some have fans inside the motor housing, very few have run capacitors. If you can tell me the Brand and M/n, I maybe able to come up with the correct motor ID and frame number.

  4. #4
    Join Date
    Oct 2007
    Austin Texas
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    Had similar problem on 2 of my downblast units, burned out the cap but not the motor. Turned out to be unit shaft bearings (units were of similar age) repaced blower shaft bearings and all good.

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