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Old 06-06-2023, 01:54 PM   #1
Join Date: Feb 2015
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Rear A/C duct

Anyone have an idea why Winne would use styrofoam ducting behind the rear cap? Noise isolation maybe? I am wondering if I should replace it with tin and be permenant.
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Old 06-06-2023, 02:00 PM   #2
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Originally Posted by mn.roadking View Post
Anyone have an idea why Winne would use styrofoam ducting behind the rear cap? Noise isolation maybe? I am wondering if I should replace it with tin and be permenant.
I would think with tin it would be hotter with engine heat. Even the tin needs insulation over it. I would just make sure it is sealed well. Mine had an air leak when I had my Journey. If it aint broke . . .
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Old 06-07-2023, 04:23 PM   #3
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This type of ductwork is used in many commercial buildings. I think the problems with Winnies install is that the side sealed is not placed against the wall. And the few amount of attaching brackets.
Dan & Sharon (Zena-Our Yorkie Puppy)(Kasey-Our Yorkie Puppy RIP 9Jan05-26Jul17) On the Road (2012 Journey 36M, 2020 Chevy Equinox)
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Old 06-08-2023, 08:21 PM   #4
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To patch leaks I used a broomstick and a yardstick to apply metallic duct tape. That was 2013 and it's still holding.
On my MH I had to remove the sheet metal around the rear engine access to expose the ductwork.
2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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Old 06-09-2023, 09:35 PM   #5
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I love my basement AC, after I fixed the seams problems the OP decribed.

And I would never buy an RV with noisy roof ACs.

All you need to do is seal your duct joints and you too will love your basement AC (again).

Winnebago cheeped-out on insulating and sealing the vents on the rear cap, but this is not reason to run away from the basement AC configuration so many people complain about, when all they need to do is fix their venting problems.
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Old 06-10-2023, 10:18 AM   #6
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Our 2001 gas powered Adventurer with the basement air did have tin ductwork. Many of that era had a problem with the tin ducts detaching where the elbow went from the vertical to the horizontal. When that happened the cold air never entered the living space.

We had that problem early on. It was a beast to repair since there was almost no room between the end cap and the ductwork.

I'm guessing they went to foil lined Styrofoam in diesel units to eliminate connection problems and minimize noise from the engine compartment.
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