Install fantastic fan - Fiberglass RV


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Old 07-13-2016, 07:48 AM   #1
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Install fantastic fan

Intend to change my vent over my bed to a fantastic fan. Seen several install videos on utube but looking for info installing on fiberglass. I thought the butyl tape would be enough but is see additional stuff on utube on other trailers. Need more to seal?
Bigfoot 21
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Old 07-13-2016, 10:14 AM   #2
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What kind of additional stuff? We used butyl and had to really build it up on one side because of the uneven and oddly sloped roof on our 1999 Burro, then went ahead and used Sikaflex 221 around the edges just because that seems to be what professional installers do. Not sure that part's necessary. After only 2 months the Sikaflex is yellowing BTW. I bought a tube of Siakflex 505 UV to use on our next vent install instead, hopefully it won't yellow... would love to hear other experiences as well.
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Old 07-13-2016, 10:15 AM   #3
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You'll need a spacer. Mine is plywood. Measure from the flange to the bottom. That's the minimum. If you are over, the trim will cover it.
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Old 07-13-2016, 10:19 AM   #4
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Do not understand spacer. I got the impression from utube that the interior flange be trimmed down skinnier if roof not thick enough? No spacer on Friday in bathroom. .??
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Old 07-13-2016, 10:32 AM   #5
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Quote:
Originally Posted by Chris Z View Post
Raz
Do not understand spacer. I got the impression from utube that the interior flange be trimmed down skinnier if roof not thick enough? No spacer on Friday in bathroom. .??
Thanks
Spacer...
Usually a spacer is used to allow space for the inside frame to mount.
It also allows material to attach the flange fasteners.
The second picture shows one without the spacer installed, note that without a spacer, there is no place to install the four corner screws for the inside frame or to get a nice finished.
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May 2009 026.jpg   DSCF0210.JPG  

1978 Scamp 13 004.jpg  
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Old 07-13-2016, 10:36 AM   #6
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When I installed a Fantastic Fan in our Uhaul I didn't need any spacer. I did have to cut down the vertical part of the interior trim piece as is mentioned in the install instructions. Our Casita SD 17 has a Fantastic Fan above the side dinette area, center of roof, and a A/C unit towards the rear.
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Old 07-13-2016, 01:27 PM   #7
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Chris, your fan will come in 2 pieces. The first is the fan, controls and cover. The second, the trim. You cut a 14" x 14" hole and drop the fan in. The fan flange stops it from going through the hole. What ever sits below the ceiling determines the spacer thickness. Remember on stick built trailers there is framing and insulation so a spacer is not necessary. As Floyd says, the spacer is what the fan screws into through the roof. Then you cut the trim piece to fit. Raz
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Old 07-13-2016, 01:49 PM   #8
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OP has a Casita SD, same as ours. I'm not going to take things apart to see how they did it, but our Fantastic Fan does not have a spacer, at least one that can be seen. Sounds like OP is going to install his fan where the roof mounted A/C unit would go if that option was chosen, so there's a good chance the roof has some thickness there. He'll know once he gets into it. I assume there is a vent there already. EDIT, in post #1 he says he is replacing an existing vent, so FF should be a drop in install.
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Old 07-13-2016, 03:32 PM   #9
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On the roof, is the butyl tape and maybe a little caulk over the screws sufficient?

Mary and Bob, I thought that was what I expected- cut down vertical portion of the interior part but was not sure.
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Old 07-13-2016, 03:46 PM   #10
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I would use butyl tape under the flange. I like Pro Flex RV sealant for on the screws, but it only comes in a caulk gun tube, and seems to harden up in the tube before you use it again. Floyd or others may have a better suggestion.
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Old 07-13-2016, 03:52 PM   #11
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Quote:
Originally Posted by mary and bob View Post
OP has a Casita SD, same as ours. I'm not going to take things apart to see how they did it, but our Fantastic Fan does not have a spacer, at least one that can be seen. Sounds like OP is going to install his fan where the roof mounted A/C unit would go if that option was chosen, so there's a good chance the roof has some thickness there. He'll know once he gets into it. I assume there is a vent there already. EDIT, in post #1 he says he is replacing an existing vent, so FF should be a drop in install.
Bob, I installed a Fantastic fan about three weeks ago. There is at least I" between the flange and the bottom of the fan. How thick is the Casita roof and what is the fan screwed into?
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Old 07-13-2016, 04:17 PM   #12
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Some utube videos I watched showed them cutting the vertical flange down to fit thickness of roof. I suppose this is standard or add a spacer?
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Old 07-13-2016, 08:46 PM   #13
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Originally Posted by Raz View Post
Bob, I installed a Fantastic fan about three weeks ago. There is at least I" between the flange and the bottom of the fan. How thick is the Casita roof and what is the fan screwed into?
Raz; I'm really not sure as the Fantastic Fan was there when we bought the Casita. I think it is not very thick from what I can see, and that section of the roof is actually a little flexible. On the outside there is so much caulk around the Fan flange that I can't see anything up there. It's possible, and I'll have to look again to verify, that maybe the roof has a spacer on the outside. Where the OP wants to install his Fantastic Fan is where a roof top A/c unit would go, at least that is where ours is. So my theory is, and again just a guess, that all Casitas were built with the roof reinforced in that area to accept a A/C unit. I was told by a Casita owner that it actually cost more to buy one WITHOUT the A/C, as A/C was considered standard production procedure. Can't verify that statement !! Looks like the answer is, pull out the old vent, see how the Fantastic Fan fits, be prepared to make a spacer if it looks like you need it. Next problem, getting wires up there from the fuse panel.
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Old 07-15-2016, 07:58 AM   #14
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Ff people have told me to trim inside to depth I want, I just learned.
Thought I should post
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