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Old 01-22-2011, 08:45 PM   #11
Head Rambler
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 4,598
Turn your furnace on and go feel for warm air coming out the duct. I stand by my original assessment, it's a heating duct.

Salem 29RKSS Pushing a GMC Sierra 2500HD!
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Bama Rambler is offline   Reply With Quote
Old 01-23-2011, 07:45 AM   #12
Senior Member
Join Date: Aug 2009
Posts: 627
It might be to heat that area if the water pump is in there. My Rockwood 5th wheel has a duct that dumps into the belly where the tanks are. Just one caveat, before plugging the duct to increase flow to other areas, look at the manual for the furnace and make sure that there is enough ducts coming off of the furnace. Mine manual saves something like 3 or 4 4" runs as a minimum.

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