Exhaust Fan wiring

[fordor]

I am installing a exhaust fan in my garage. It's a "in wall" fan. I need to know what I need to wire this so that I may vary the speed of the fan. Right now it just runs on one speed. I want to be able to vary the speed. Any help would be apppreciated .

Bob

 

[Charles (in GA)]

Is the fan made to be variable speed? If not, its highly unlikely you can come up with a variable speed system that won't cost an arm and a leg.

Charles

 

[fordor]

It's not.

Thanks for the info.

 

[PassnThru]

Check with the manufacturer - they may offer a variable speed control. Can't hurt to look.

 

[KCarGuy]

I have a Variable Speed Fan, It came with 4 position switch (off low med hi)
and there is 5 wires that needed to be wired correctly.

Are you trying to run your at a slower speed?

 

[Colin-Roberts]

This will decrease the life of the fan but you could increase and descrease the power sent to the fan to make it spin slower or faster, something like a dimmer switch but for a fan would work for this

 

[Freejack]

Is the fan direct drive or belt drive?

If its direct drive, you could wire up a fan speed control to the motor and vary the speed. Something like this: http://www.grainger.com/Grainger/items/1DGV2?Pid=search

Note fan speed controls can be hard on motors especially if you run them below 50% at all.

If the fan is a belt drive, then you will not be able use a fan speed control, as that motor will have an internal starting switch that kick out if you drop the RPM.

Jake

 

[6768rogues]

If the motor is not made to be multiple speed and a control for multiple speed is not available, I would not run it on a dimmer. A dimmer varies voltage and running a motor on reduced voltage will cause it to overheat.