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Old 02-07-2011, 10:49 AM   #4
ShrimpBurrito
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Join Date: Jul 2006
Location: Sunny Beaches of Los Angeles
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It looks like the method they describe is only applicable to furnaces that have duct work, which the TMs do not have.

Have you ever tested the bathroom exhaust fans in the display at Home Depot? The loud ones typically don't move alot of air, but they are the cheapest. The more expensive ones are quiet (less sones) and move more air.

My guess is therein lies to answer to why the furnace is so loud.

Dave
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