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Old 01-12-2009, 05:43 PM   #1
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1996 25' Excella
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Is furnace duct hose the same as household dryer duct hose?

I'm think of replacing the 4" duct work on my furnace. It seems to me that RV dealers charge a bit of a premium for 4" ducting, so I'm wondering if the 4" duct hose that is used in RVs (namely my 81 International) is the same as the 4" duct hose that is used in household dryers?

81 27' International
2006 Dodge Megacab 2500 CTD 4x4
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Old 01-12-2009, 07:20 PM   #2
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Originally Posted by Bearstream1 View Post
I'm think of replacing the 4" duct work on my furnace. It seems to me that RV dealers charge a bit of a premium for 4" ducting, so I'm wondering if the 4" duct hose that is used in RVs (namely my 81 International) is the same as the 4" duct hose that is used in household dryers?

81 27' International
2006 Dodge Megacab 2500 CTD 4x4
Good question. I don't know for sure but I would think that you could get a 4" heater duct from your local heating and cooling supply house, maybe Lowes, or Home Depot.
I would go to a local Heating and Cooling contractor. I don't think 5' to 10' of it would be that expensive.
Of the dryer hose I've seen, I wouldn't use it's too cheap in construction. There is a flexible metal duct that looks OK but who knows.
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Old 01-12-2009, 08:23 PM   #3
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To Duct or not to Duct

Brandon, They make an insulated flexible duct that holds up very well over time and would be a lighter weight than standard 4" retangular duct as was original equipment in these trailers. I have had said flex duct installed on my bathroom ceiling vent fan for twenty years and it still looks like new. I installed the same duct on my dryer vent when I added rooms onto my home back in 1995 and they both run through the unheated attic space of my house. No condensation problems as with metal ductwork so no getting your insulation wet under your floor. I bought mine at Lowes but I'm sure any good hardware or heating/cooling wholesale/retail store would carry it. Cost was acceptable and as I said it has held up very well. Hope that this helps with your question. Happy Trails, Ed
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Old 01-12-2009, 08:35 PM   #4
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Likewise, I couldn't say for sure if it's the exact same product but, will it do the job?
I would say, all things being equal, if it's the same size, etc.. why not use it? I can't imagine that the two appliances (furnace and dryer) are that far apart in the heat they produce.
On the other hand..
I have seen heat duct tubing made with aluminum foil instead of brown plastic.
Looks to be better product and, studier than original.
Check your local Lowe's or Home Depot.
Good Luck`
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Old 01-12-2009, 10:21 PM   #5
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Thumbs up Aluminum "foil" ducting

" 53flyingcloud " I have the new aluminum "Foil" looking air ducts you are talking about in my AS.
" Bearstream1 "
These are the ducts I would recommend.
That is what I installed when I was rebuilding the rear 2/3 of my aluminum cash pit. And they are fitting, as they are made out of ALUMINUM..
It works like a charm. I bought them at Lowes and know that Home Depot, Ace and others carry the same type product. It is actually a heater duct product. There is a difference in the dryer ducting as it is not as flexible as this is. I tried a piece of the drier duct and it would not make one of the corners I needed. Went with this and am glad I did.

The aluminum "foil" ducting comes ,at Lowes, in 25' long sections and 2 of them completed the job on my 34 ftr.

I am now rebuilding the furnace, a Suburban NT35K, as the "board" gave out. But after 18 or 19 years, what can you expect. When I get the furnace back in, I will be seeing more even heat and better air flow. Just received the new Dinosaur board, a new sail switch and a couple gaskets in the mail today. Have to cut 3 other gaskets myself, but not a problem.
I received very good service from Mark's RV Supplies. Interesting note. Marks RV Supplies is in New York state. The Dinosaur boards are made in Lincoln City, Oregon. That only is about 40 or 50 miles south of the place I go to the most on the Oregon coast, Wheeler on the Nehalem River. And I live in Washington so the part went back and forth across the country.

But good to get the correct parts the first time along with good service.

Hope you have good luck with your project.
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Old 01-26-2020, 12:30 PM   #6
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Main difference I think is that dryer vent is not insulated, and if it's crushed it won't bounce back. Personally, like others have said, go to a heating and cooling place or maybe a big box store and puck up some 4" insulated flex pipe, usually comes in 25' lengths.
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Old 01-26-2020, 01:59 PM   #7
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They also have insulated....but you may find tight areas in your run where insulated is too large.

Less than $1 per foot. I've used it and no issues.

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Old 04-14-2020, 09:10 PM   #8
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use only the UL listed silver flex material you find at lowes, home depot.. The white stuff can catch on fire too easy. the UL listed stuff is more fire proof.
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Old 04-15-2020, 12:46 AM   #9
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Lots of product available on Amazon that would suit this purpose.

Try this one - 4 layer with wide temperature range.
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