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Old 12-05-2014, 07:04 PM   #1
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Join Date: Feb 2012
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Heating duct mystery

after looking under my couch in my seaview I noticed a heating duct that
goes down under the floor of the coach? does anyone know exactly where
this duct goes? I cannot seem to find where it goes. thanks for any help
or opinions on this mystery duct?
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Old 12-05-2014, 07:08 PM   #2
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Sounds like it may be basement heat supply. Have you looked in the basement where the tanks or service bay is ?

Cliff,Tallulah and Buddy ( 1999-2012 )
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Old 12-05-2014, 08:54 PM   #3
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Location: Lac Du Bonnet, Manitoba
Posts: 677
Though ours isn't the same model but is in the National family , I believe there is one
going down and comes up under the washroom vanity and one goes down into a closed in space in the basement where the water pump is located. ( behind the water service/control valve panel) This image doesn't show where this one goes but I believe I saw it when I had the Plumbing panel off and looked
across this cavity and saw a heating hose at the other end. I hope you find the answer.
Ellen & Greg
08 National Dolphin DL-35Ci, RoadMaster Rear Sway Bar, Rear Trac Bar, Koni Shocks Front,
Workhorse W22, Kelderman Air Ride, Towing 2016 Smart Car
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Old 12-06-2014, 10:07 AM   #4
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Posts: 2,618
I have two in my 99 Tradewinds. One goes into the tank area for gray and black tank heating. The other goes into the area that has the fresh water tanks. I can see a plywood box over the fresh water feed in the forward bay on the passengers side. We have a front door entry so yours is no doubt not in the same place.

These make the coach year round useable according to the National propaganda.

1999 Tradewinds 7372 Cat 3126
Albuquerque, NM
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Old 12-06-2014, 12:48 PM   #5
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Mine has a heating duct that enters the basement and terminates above the gray tank for basement heating.

A second duct goes into the same space but renters the living space in the bathroom and feeds that room as well as a second register in the bedroom.
2003 34' Dolphin 5342, W22, UP, UPGBrake, F and R Track Bars, Rear IPD sway bar, Koni FSDs, Safe-T-Plus, Scan Gauge II.. 2004 Jeep Liberty, Blue-Ox Adventa..
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