PWM speed control for my Fantastic Fan

Anthony Hitchings

Super Active Member
Gold Supporting Member
Mar 2, 2019
Oakland, California
Refreshing my memory on this subject:

On low it will draw 1.86 amps, on medium 2.29 amps, and on high 3 amps.

well - the PWM is rated for only 2 amps :-(

maybe I shoudl add an in line resistor to limit the maximum current

maybe even use the appropriate leg of the OEM wire resistor?
Last edited:


Super Active Member
Platinum Supporting Member
Dec 26, 2009
Albuquerque, NM
So far, the PWM has worked great with the fan in our TT. The dial speed control is much better than the L-M-H one originally on the fan. (The brand name of the fan escapes me at the moment, and the camper is covered up.)
Since we mostly dry camp, being able to leave the fan on low all day, with the bathroom door propped ajar, has worked very well in hot weather, it draws the air through the trailer and out the fan. Doesn't matter if we're inside or out, just makes the trailer more comfortable all around.

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