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05-16-2018, 08:30 PM
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#1
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2 Rivet Member
1968 28' Ambassador
Southwest Ranches
, Florida
Join Date: Nov 2015
Posts: 47
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Running furnace ducts near gray tanks
Hello!
I'm trying to figure out the best way to run a furnace duct from the front of our 68 Ambassador (inside the door and immediately to the left) to the rear of the trailer so that there's a hot air outlet near the bathroom/bed area.
Here are some pictures of what I'm thinking would work well, running the duct along the frame rail through the crossmembers, but I don't know
1) how hot will the duct get?
2) will the heat of the duct affect/deteriorate the gray tank over time? It's the gray tank from Vintage Trailer Supply. Made of polyethylene. https://www.vintagetrailersupply.com...-p/vts-851.htm
Any help or guidance would be much appreciated!
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05-16-2018, 08:42 PM
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#2
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,656
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I'd wager no more than 120* at most. I'd be asking the question of whether your heat loss to the underbelly is going to be too great to warm the end of the run. So, to eleviate both concerns, I'd insulate the ductwork with plastic backed duct insulation.
__________________
-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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05-16-2018, 08:44 PM
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#3
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3 Rivet Member
Jeffersonville
, Kentucky
Join Date: Feb 2017
Posts: 139
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I'll be watching the replys. I've been planning doing that exact same thing on our 69 ambassador
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05-16-2018, 08:46 PM
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#4
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3 Rivet Member
Jeffersonville
, Kentucky
Join Date: Feb 2017
Posts: 139
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I think i have a little more room for the pipe on the 69
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05-17-2018, 05:15 PM
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#5
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3 Rivet Member
2009 27' FB Classic
Sioux Falls
, South Dakota
Join Date: Oct 2009
Posts: 117
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I'd recommend that you use fiberglass flexible 4" duct (about 6" actual OD) This can be compressed in tight quarters. The 1" insulation will will take care of the heat loss and will be very easy to run. It is also very quiet. The polyethylene can handle up to 200+ degrees F. You do want some heat loss to help keep the tank from freezing in cold weather camping. I would let the duct next to the tank be metal with no insulation and the rest of the run be the flex duct,
Happy streaming
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05-17-2018, 06:21 PM
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#6
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Rivet Master
1986 34' Limited
1975 27' Overlander
1969 21' Globetrotter
Conifer
, Colorado
Join Date: Jun 2009
Posts: 8,289
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I think I remember that the furnace outlet temp is about 180 degrees F. Your furnace may have 3 outlet ducts from the plenum. By the time the hot air reaches the tank, it will be much less that 180, maybe 100 or less. The polyethylene tank can handle that temp, no problem. Actually, heat loss in that metal duct will help warm the tank compartment to keep it from freezing. Airstream typically heats the tank compartments to reduce freezing.
David
__________________
WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !
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05-21-2018, 06:54 PM
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#7
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2 Rivet Member
1968 28' Ambassador
Southwest Ranches
, Florida
Join Date: Nov 2015
Posts: 47
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Quote:
Originally Posted by dznf0g
I'd wager no more than 120* at most. I'd be asking the question of whether your heat loss to the underbelly is going to be too great to warm the end of the run. So, to eleviate both concerns, I'd insulate the ductwork with plastic backed duct insulation.
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Thanks! What do you mean by plastic backed duct insulation?
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05-21-2018, 07:11 PM
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#8
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Rivet Master
2007 30' Classic
Oswego
, Illinois
Join Date: Jul 2010
Posts: 13,656
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Quote:
Originally Posted by mashburn.nick
Thanks! What do you mean by plastic backed duct insulation?
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There is 4" insulated flexible duct material available.
__________________
-Rich-
"If the women don't find you handsome, they should at least find you handy." - Red Green
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05-22-2018, 06:32 PM
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#9
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Rivet Master
1986 34' Limited
1975 27' Overlander
1969 21' Globetrotter
Conifer
, Colorado
Join Date: Jun 2009
Posts: 8,289
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Here is the outfit I purchased my 4" flex ductwork from. I didn't get the insulated one as I didn't have room for the extra diameter. I ran my ducts close to my holding tanks with no insulation and no problems.
https://www.dwincorp.com/
Here is a photo of the underfloor ductwork I did on a 66 Trade Wind. The duct on the left dumps right into the holding tank compartment to keep it from freezing on a cold Minnesota night.
David
__________________
WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !
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05-22-2018, 06:45 PM
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#10
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2 Rivet Member
1968 28' Ambassador
Southwest Ranches
, Florida
Join Date: Nov 2015
Posts: 47
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Quote:
Originally Posted by dbj216
Here is the outfit I purchased my 4" flex ductwork from. I didn't get the insulated one as I didn't have room for the extra diameter. I ran my ducts close to my holding tanks with no insulation and no problems.
https://www.dwincorp.com/
Here is a photo of the underfloor ductwork I did on a 66 Trade Wind. The duct on the left dumps right into the holding tank compartment to keep it from freezing on a cold Minnesota night.
David
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Thanks, David! Do you know how that ductwork would hold up to the beating it'll get being towed around? I can't tell what it's made of but I'd be worried that over time it might deteriorate or the cross member would rub a hole in it?
Nick
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05-22-2018, 07:50 PM
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#11
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Rivet Master
1986 34' Limited
1975 27' Overlander
1969 21' Globetrotter
Conifer
, Colorado
Join Date: Jun 2009
Posts: 8,289
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I feel it will outlast the trailer. Our 86 Limited 34' has this same stuff in it throughout, both above and below the subfloor. No worries.
David
__________________
WBCCI #8607 VAC Region 11
KnowledgeBase trailer renovation threads: 69 Globetrotter, 76 Sovereign, 75 Overlander, 66 Trade Wind Such fun !
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