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Old 02-22-2020, 06:53 PM   #1
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Roof vent

We want to install one of the sunroof vent fans where the escape hatch is. The opening is 22 square on the escape hatch. All the roof vent fans seem to be standard 14 square. Has anyone found a larger one that either fits perfectly, or at least requires less work? Any advice on how to build out the opening to fit a standard one? Thanks!
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Old 02-22-2020, 07:01 PM   #2
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A local HVAC guy could bend something up for not much.

Key is not providing anyplace for rain to pool, downhill all around, double up on butyl rubber and adhesive sealant, maybe 3M 4200 the UV resistant one.
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Old 02-22-2020, 07:44 PM   #3
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Originally Posted by Dragon Wagon View Post
We want to install one of the sunroof vent fans where the escape hatch is. The opening is 22 square on the escape hatch. All the roof vent fans seem to be standard 14 square. Has anyone found a larger one that either fits perfectly, or at least requires less work? Any advice on how to build out the opening to fit a standard one? Thanks!
Most people just skin over the 22" opening with sheet metal, then cut a new 14" hole for the fan. I think we used 16 or 18ga sheet metal on ours.
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Old 02-22-2020, 08:10 PM   #4
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Most people just skin over the 22" opening with sheet metal, then cut a new 14" hole for the fan. I think we used 16 or 18ga sheet metal on ours.
Well that sounds simple enough!
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Old 02-22-2020, 08:11 PM   #5
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Originally Posted by john61ct View Post
A local HVAC guy could bend something up for not much.

Key is not providing anyplace for rain to pool, downhill all around, double up on butyl rubber and adhesive sealant, maybe 3M 4200 the UV resistant one.
Makes sense. I was hoping for a bigger vent, but Im just not finding any.
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Old 02-22-2020, 08:16 PM   #6
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14 x14 is industry standard. That way they can put in a/c or fans in those spots.
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Old 02-22-2020, 09:49 PM   #7
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Well that sounds simple enough!
That's the method.
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Old 02-23-2020, 11:05 PM   #8
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If you're persistent, you can get a bigger one in there. Look up Dometic. Heki skylight. Comes in two sizes
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Old 02-23-2020, 11:08 PM   #9
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o1marc hasn’t replied. I liked his solution which was to make a lexan lid for the original emergency opening and then cut in the new opening size
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