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Old 02-19-2007, 01:19 PM   #11
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Old 02-19-2007, 11:23 PM   #12
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What you're going to find is, the gaskets they sell to seal them with are only 14" and it's pretty likely anything larger is just not going to fit the under side of the roof top unit.

You probably could formulate some kind of fan system and a screen without too much trouble though. I like having just an opening hatch up there....with screen of course...
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Old 02-19-2007, 11:46 PM   #13
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What would happen if you cut a hole into the hatch cover itself and mounted the AC on the hatch cover?
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Old 02-19-2007, 11:56 PM   #14
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I dont see the plastic hatch cover holding up to the vibration nor the weight that a roof top unit has. I would be keeping the escape hatches for just that, as they are designed for. And cutting a couple of 14" holes in the roof to accept the AC units.
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Old 02-20-2007, 12:15 AM   #15
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I see your point, I was sure hoping to try avoiding cutting another hole in the roof...
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Old 02-20-2007, 12:45 AM   #16
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Good idea with the drill a hole and fill with foam idea, Frank. Are you concerned at all about trapping water or anything? That seems like something I might want to try.
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Old 02-20-2007, 10:07 PM   #17
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Well, if you wind up laying that bus over on it's side somehow, climbing out the roof hatch might be handy!!

I think in the long run, you'll be better off cutting a hole the correct size rather than trying to retro a hole that is too big.
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Old 02-20-2007, 10:36 PM   #18
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Quote:
Well, if you wind up laying that bus over
You see a lot of roll-overs?
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Old 02-21-2007, 01:48 AM   #19
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It would have to be a pretty spectacular rollover to block the side door, rear door, and kick-out front windows.
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Old 02-28-2007, 10:50 AM   #20
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I see a couple obvious things:
The hatch cover is too weak to support the AC unit. Simply make a cover or adapter (sheet ply with aluminum covering, self-adhesive foam tape to seal off), place that in the opening, and use longer screws or threaded rod to replace the now-too-short ones.

Next, if you use/build the adapter, maybe set it up so that a couple hold-down latches can be built in....SOMEONE out there makes them, I've seen similar latches in hardware stores (National Hardware brand?). Then if you need the roof exit in case of a rollover, you unlatch the AC, drop it off, and bail out.
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