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Old 04-15-2013, 12:25 PM   #1
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Join Date: Apr 2013
Posts: 3
Default Rooftop AC Shims

I have a 2005 T-139 and three corners of the AC are supported by squares of large cell white foam. The fourth corner is resting directly on the roof and looks off kilter. Is this intentional for drainage purposes, or is one foam shim missing?


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Old 04-17-2013, 10:27 AM   #2
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Join Date: Oct 2010
Location: Southwest Arizona
Posts: 624

It isn't unusual for the AC pan to be tilted to one corner if the pan doesn't have a dedicated drain slot or hole located in it somewhere. The pan collects the condensate and to avoid a puddle of water sitting in the pan leading to stagnant smelly water and rust out of the pan, they are usually mounted so that one corner is low to aid in making the water run out of the pan and across the roof.

Hint- When you set your trailer up at a campsite, make the front ever so slightly higher than the back and make the curbside (the side with the door) ever so slightly higher than the street side. Even as much as a half an inch won't be noticeable inside the trailer and that will cause the water to drain off the rear, streetside corner of the trailer. No drips on your neck, no muddy areas on the "people" side of the trailer or the pass through doors on either side and if you develope black streaks, they will be predominantly in one spot.

My 2 cents, your mileage may vary...

2 Cats; J-Lo and Ragamuffin :R

2014 Thor Tuscany 40RX DP
2011 Ram 2500 Longhorn CTD HO
2011 Keystone Cougar 318SAB (now gone)
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