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Old 07-18-2004, 06:39 PM   #1
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AC hole cut-out framing

Someone framed the cut-out hole for the air conditioner on our 67 Airstream with square pieces of wood making the roof and ceiling surface conform to a "flat" surface to mate with the flat surface of the air conditioner bottom instead of curved to match the contour of the rounded roof and ceiling. Which is correct?

David
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Old 07-18-2004, 08:18 PM   #2
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It depends on the AC that is used/installed.

If you install a Dometic Penguin WITH the pan that Airstream uses and then it will conform more to a curve. The hardest thing is find is a unit that will look good on the rounded curve. IF the faming is solid and secure I would use it if it is inside the skins. If it is on th outside I would remove it. There often needs to be some bracing to install a newer AC on the Airstream style of roof is normal. The new AC's clamp through the inner and outer skins. Without the bracing the skins will be pinched together and create a leak.
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Old 07-18-2004, 09:09 PM   #3
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frame for air conditioner

Quote:
Originally Posted by thenewkid64
It depends on the AC that is used/installed.

If you install a Dometic Penguin WITH the pan that Airstream uses and then it will conform more to a curve. The hardest thing is find is a unit that will look good on the rounded curve. IF the faming is solid and secure I would use it if it is inside the skins. If it is on th outside I would remove it. There often needs to be some bracing to install a newer AC on the Airstream style of roof is normal. The new AC's clamp through the inner and outer skins. Without the bracing the skins will be pinched together and create a leak.
The unit is a Coleman and the wood framing is between the skins but again it forces the skins to be flat. I am wondering if I should replace them with curved pieces to match the curved roof? If I do that then the roof will not fit against the flat bottom of the air conditioner.

David
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Old 07-18-2004, 09:15 PM   #4
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How much of the roof is flat? Coleman have a gasket about 1 1/4" wide that they mount on, that is all that really needs to be flat.

John
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Old 07-18-2004, 09:27 PM   #5
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air conditioner hole is flat

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Originally Posted by 74Argosy24MH
How much of the roof is flat? Coleman have a gasket about 1 1/4" wide that they mount on, that is all that really needs to be flat.

John
That's right the area that is flat is about 14" x 14" but I am woried that in a rain storm the water might not run off as it would with a curved surface.

David
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Old 07-18-2004, 09:42 PM   #6
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The gasket is pretty far back under the shroud, any rain should end up on the curve. If it leaks it probably would show up first after towing. The ac is held on with 4 bolts, if it starts to leak tightnen them a little. If that doesn't help replacement gasket is available. Nearly every SOB has a totally flat roof and ac leaks aren't that much of a problem or are pretty easy to deal with.

John
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Old 07-19-2004, 10:55 AM   #7
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ac install

first thing are you using a drip pan?? Coleman ac??
if so the roof needs to be semi flat to install the drip pan. the drip pan is sealed to the roof with vulkem. ac gasket must be notched to fit drip pan. then the ac is placed into the pan and sealed from the inside (i used par bond white), before you install the ceiling unit.
if you are installing a dometic the procedure is a little different.
no drip pan?? just sit on the top and tighten the unit down with the three or four bolts. don't remove or change the bracing. my mh came with metal bracing and it is not curved to match the roof line. you wont see the 14x14 space any way. you will have a space on the sides about 1/4 inch more if the unit isn't centered.
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Old 10-05-2006, 11:34 AM   #8
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I have a Coleman unit on mine, that needs to be replaced.

Do you know if there is a drip pan on these?

I found a small hose exiting thru the belly pan by the fridge, I think that is the a/c drain but not sure.

Also what brands are easy which are a PIA?
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Old 10-05-2006, 11:53 AM   #9
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If I am picturing this correctly you may not be able to take out thee wood frame and have the roof return to its original contour. Once the aluminum is stretched it will not return to its original shape. I would leave the frame in place.
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