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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2000 2720SL & 2007 3124KB
2005 Toyota Sequoia
Twin Battle Born 12v 100Ah LiFePO4 (BBGC2) batteries, 300W solar on rear shell, Link 10, Lift kit, Maxxis 8008 225 75/R15 E tires
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