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40cpe · 06-30-2020, 08:46 PM

If you cut a fourth hole, I've seen shrouds with flappers over the vent holes that close when the fans are sucking and open when air passes through at speed.

06-30-2020, 08:46 PM	#2
40cpe Senior Member Join Date: May 2010 Location: Star, MS Posts: 4,024	Re: Electric fans If you cut a fourth hole, I've seen shrouds with flappers over the vent holes that close when the fans are sucking and open when air passes through at speed.