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I have had a similar problem with low air flow to the bedroom.
I discovered that the duct that runs under the steps was crushed a bit.
I am installing wood steps as seen in another post and I am also installing a second vent with larger duct work to the very front off the bedroom boxing it in and insulating it. Mine is a toy hauler, nobody ever sleeps back there in the garage so I sealed off the heater vent to it.
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 2007.5 Silverado 3500 HD,DRW, LTZ red, afe II airbox w/ torque tube, transferflow 56 gal replacement tank,
banks speed brake, transgo jr shiftkit, aux trans cooler, b&w companion hitch.
2010 Fuzion FZ 302 has 12ply F-loads, Dexter ez-flex w/ wet bolts, 6 volt Deka GC 15 batteries, 1 gen battery, solarpanels, leds inside, replaced clear textured door glass with tinted, 87 gallons of loc-tite.
Decals removed.
AKA CONFUZION / PORH HONKY.
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