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Old 04-22-16, 07:29 PM   #2
oil pan 4
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Join Date: Nov 2012
Location: NM
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Sounds like a variable speed AC synchronous motor that only runs only as fast as you need to circulate the air.
Normally you have a 2 pole motor that kicks on and only runs full speed.
The standard fractional horse power motors are pretty inefficient even if powered by a VFD.

I made a post about finding a more efficient fan motor a few years ago on here but no one had anything helpful.
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