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Old 03-18-2012, 02:18 PM   #1
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Furnace Blower Wiring

I'd like to use my old blower as a utility fan. What is the best and safest way to do this?

What kind of cord do I need and how do I hook up the wires? I don't need to be able to switch speeds (unless that would be easy to do), I'm okay with it stuck on one.

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Old 03-18-2012, 02:28 PM   #2
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When we do this we will take 1/4 wire mess and put on the openings for protection of fingers or junk getting into the blower

We will take a metal junction box and screw it to the blower housing, then take a single pole double throw switch so we can have two speeds.

The white wire off the blower goes to the pig tail white (We use an old extension cord), the black off the pig tail goes to the center terminal of the SPDT switch. of the blower motor use Black wire for High speed and the Yellow wire for high med. You can always change these wire if you need.

We then take a blank cover that has the knock out for the 1/2 wire connector. Remove the knock out and install the switch.

Mount a couple short pieces of angle bars on the blower housing where you need to hold the blower and keep it from rolling when in use.

Make sure you mount the capacitor, take black tape and wrap the terminals on the capacitor just for electrical shock protection


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Last edited by Plumber101; 03-18-2012 at 02:30 PM.
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Old 03-20-2012, 11:43 AM   #3
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This is exactly what I did. Thanks so much, it works great. I mounted the thing in a window and now have a whole house fan. Any risk of the wiring or motor overheating?
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Old 07-17-2012, 10:41 PM   #4
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I used 14 awg cord for this blower. Is that sufficient?
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Old 07-18-2012, 04:01 AM   #5
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14 AWG can handle around 10 amps (depending on length, of course) so you should be fine. As others have said, be sure to enclose ALL the openings on the fan (including the motor side) so hands cannot get in there.

I'd also put the cap in a box, and use plumbers strap to secure it. Electrical tape is fine in areas where someone can't touch it, but it's dangerous if the cap is out in the open.

Last edited by scottmcd9999; 07-18-2012 at 04:01 AM. Reason: kant speell too gud
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