I recently replaced my Vortex single-speed vent fan with the Vortex II multi-speed reversible fan. While installing the fan, I accidentally dropped the fan on to a soft bed. I was surprised to find ...
Interestingly, the PWM controller I added to my Heng's vent hood works perfectly: Link http://www.rv.net/forum/index.cfm/fuseaction/thread/tid/28032353.cfm It's adjustable and quiet throughout its speed range.
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