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Old 05-16-2018, 08:52 PM   #1
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Roof Hatch Opening Fill Options

I yanked out the emergency roof hatches during the demo phase. I put some plexi panels up temporarily to fill the hole and provide some light. I intended to put the air conditioner or fan into these holes.

I just ordered 2 Maxxfan fans and am about to order a Dometic ceiling unit but they both look like there only about 14" square. The roof hatch is closer to a 24" square.

I could of sworn I read that people used these larger holes for AV units. Am I making this up?!? Any input would be appreciated.
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Old 05-16-2018, 09:05 PM   #2
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I yanked out the emergency roof hatches during the demo phase. I put some plexi panels up temporarily to fill the hole and provide some light. I intended to put the air conditioner or fan into these holes.

I just ordered 2 Maxxfan fans and am about to order a Dometic ceiling unit but they both look like there only about 14" square. The roof hatch is closer to a 24" square.

I could of sworn I read that people used these larger holes for AV units. Am I making this up?!? Any input would be appreciated.
Bus emergency hatches are around 24" sq to allow people to get out.

Industry standard cut-outs for fans and AC are 14" sq.

Use some sheet steel to seal the large holes, and cut a 14" sq hole in the middle.
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Old 05-24-2018, 03:33 PM   #3
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I'm welding in custom hatches with clear plexiglass hatch doors.

I ran into the same issue more or less- the popular fans all have relatively small entrances, and probably for good reason. Smaller intrusion = less problems with differences in roof curvature.
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Old 05-24-2018, 03:40 PM   #4
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what gauge steel are you putting in? 16 gauge cold rolled?
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Old 05-24-2018, 04:04 PM   #5
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Originally Posted by brightond View Post
I yanked out the emergency roof hatches during the demo phase. I put some plexi panels up temporarily to fill the hole and provide some light. I intended to put the air conditioner or fan into these holes.

I just ordered 2 Maxxfan fans and am about to order a Dometic ceiling unit but they both look like there only about 14" square. The roof hatch is closer to a 24" square.

I could of sworn I read that people used these larger holes for AV units. Am I making this up?!? Any input would be appreciated.
Get some 18ga steel and cut it to size. cover the emergency hatch hole and cut a 14" hole in the new panel.

I mounted a roof vent in my cargo van and LOVE it. Fantastic and Maxxair both make excellent vents.



I put a 30x30 over the opening on my last shorty-






While you're up there get rid of the factory passive vent and strobe to avoid future or current leaks.







While youre up there run a nice new bead of 3m seam sealer on all the seams and once you've got the hatches deleted you can mount those fans and rooftop ac in any 14" hole. I'd stick some square tubing between the ribs that the ac will sit on, so that way its not just supported by the sheet steel.

Cold rolled steel is overkill. Hot rolled will do the job just as well and costs a lot less.
just my 2 cents.
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Old 05-24-2018, 04:11 PM   #6
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How about this idea. I see some have removed the escape hatches and replaced with Lexan Skylight to fill the hole. How about Lexan to fill the big hole and then mounting the fan vent in the middle of that. This would give you some ambient light into the bus.
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Old 05-24-2018, 04:41 PM   #7
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ECCB,

What is that passive vent for? Guess I'll delete it when i delete the hatches...
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Old 05-24-2018, 04:46 PM   #8
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ECCB,

What is that passive vent for? Guess I'll delete it when i delete the hatches...
Seems to be worthless to me. Just another leak source, imo. I'm all about sealing up the roof solidly!
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Old 05-24-2018, 04:59 PM   #9
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Seems to be worthless to me. Just another leak source, imo. I'm all about sealing up the roof solidly!
I'm on the same page, but I want roof access through the hatch, and I'm deleting all the windows, so...
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Old 05-24-2018, 05:01 PM   #10
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I like my whale's blow hole. And I want to keep my strobe to allow the aliens easier landing.
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