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Old 05-22-2008, 03:09 PM   #1
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1978 31' Excella 500
1961 26' Overlander
Harmony , Pennsylvania
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Question where does this duct go??

We are putting the gas lines in and this flexible hose is hanging down underneath the unit. The belly pan is off and we can't figure out where this duct hose is supposed to go.

Can someone advise us, please?
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Old 05-22-2008, 03:14 PM   #2
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Is it a fresh air intake?
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Old 05-22-2008, 03:18 PM   #3
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Quote:
Originally Posted by wannaroam
We are putting the gas lines in and this flexible hose is hanging down underneath the unit. The belly pan is off and we can't figure out where this duct hose is supposed to go.

Can someone advise us, please?

Attachment 60848
It is probably the heat for the black and grey waste tanks!
Paul
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Old 05-22-2008, 03:24 PM   #4
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Quote:
Originally Posted by airstream4
It is probably the heat for the black and grey waste tanks!
Paul
Sorry, I had two 1978 a 31' and 25' and looking at your sketch it appears to be of a rear bath model. The heat duct for the tanks came off the duct along the wall at the rear, in the closet just forward of the shower.
I have no clue what that duct would be for.
Paul
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Old 05-22-2008, 03:27 PM   #5
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1976 27' Overlander
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our 1976

On our 1976 Overlander we have flexible ducts (3 total) that heat the area around the fresh, grey and black tanks.
My guess is your forward flex duct is to warm your fresh tank area.
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Old 05-22-2008, 03:33 PM   #6
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We actually have the center bath unit. This hose in directly under the furnace.
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Old 05-22-2008, 03:36 PM   #7
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Quote:
Originally Posted by wannaroam
We actually have the center bath unit. This hose in directly under the furnace.
Our water tank in in the center of our trailer, and we have a flex hose that runs directly off of the main vent that heats the fresh tank area.
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Old 05-22-2008, 04:35 PM   #8
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1978 31' Excella 500
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Where do you put it exactly? Does it just lay above the belly pan or is it supposed to attach somewhere?
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Old 05-22-2008, 05:06 PM   #9
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As noted before, it's the fresh air intake into the furnace for the heated cabin air. The combustion intake is next to the exhaust on the side of the trailer. And yes, it just hangs there.
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Old 05-23-2008, 02:01 AM   #10
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Could it be that that duct supplies some heat under the floor, just forward of the fresh water tank that's mounted over the axles?

It's probably just blowing enough warm air into that cavity between the floor and belly panels to keep the temp above freezing....
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Old 05-23-2008, 07:15 AM   #11
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I think ducts go south for the winter...
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Old 05-23-2008, 09:24 AM   #12
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Ooops!

Yes, the ducts go south where it's warmer. That hose take heated air into the belly pan to keep pricey things from freezing. Brain f---, sorry. A lesser man would be embarassed.
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Old 10-28-2013, 08:45 AM   #13
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Quote:
Originally Posted by wannaroam View Post
We are putting the gas lines in and this flexible hose is hanging down underneath the unit. The belly pan is off and we can't figure out where this duct hose is supposed to go. Can someone advise us, please?
Just curious what you ended up doing with this duct? Mine has the same configuration in the service manual, but I can't see what relevance this duct has when the other two ducts are so near the tanks .
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