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Old 11-15-2012, 10:21 AM   #1
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Mounting a fantastic fan cover

I purchased the black covers to go above the fantastic fan so I could use while traveling and as a rain cover. It requires that four screws be removed to allow for the mounting brackets to be attached. My fan does not have any screws for mounting. I attempted to use the silicone roof/seam sealer that is made for that type of project but it is slow to cure and I wonder if that material will be strong enuf to glue the brackets down well enuf the keep the covers in place. Anybody have a solution? I don't want to drill!
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Old 11-15-2012, 10:28 AM   #2
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I've never seen a roof vent that didn't have mount screws covered in lap sealant, and I would not trust the cover to sealant alone.
Can you post a picture of you roof vent ?
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Old 11-15-2012, 10:32 AM   #3
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I installed a vent cover over my Fantastic fan but I drilled four holes to accept the brackets that held the cover on. I agree, I don't think you want to depend on sealant or adhesive to hold the cover on. I would be concerned with water getting between the vent and the vent cover with no place to go.
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Old 11-16-2012, 03:26 AM   #4
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The four screws mentioned in the instructions are under (usually) Dicor lap sealant near the side corners of the fan assembly into the roof. After installation be sure to reseal with a lap sealant. Do not use silicone as this is a poor sealant for these materials and application.
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Old 11-16-2012, 10:54 AM   #5
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Quote:
Originally Posted by RV Wizard View Post
The four screws mentioned in the instructions are under (usually) Dicor lap sealant near the side corners of the fan assembly into the roof. After installation be sure to reseal with a lap sealant. Do not use silicone as this is a poor sealant for these materials and application.
I have purchased the Lap Sealant to cover the brackets and screws after the installation and this is what I was improperly referring to as silicone. However when I removed the Dicor (factory installed sealant) to get to the screws, all I found was a flange without any screws. The flange appears to be held in place only by the sealant. I suppose it could be held in by screws from below that would act like a clamp when tightened. The brackets that come with the vent cover are designed to be attached to the flange by one of the screws that attach it to the roof Since there are no screws it seems that I have a choice. That is to drill holes and install my own screw, or to attach the brackets with a type of adhesive. I do not like either method unless someone can convince me that the adhesive will hold. Drilling holes may allow for 4 areas with a tendency to leak or I may drill into something that may cause me other problems.
I would like better odds for success than I now see available to me.
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Old 11-16-2012, 11:30 AM   #6
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Interesting that you don't already have factory screws drilled in to hold the fan. I've installed the fan covers on several trailers and MHs in the past and they all had the screws installed. On the other hand I'd drill the new holes and install the cover per instructions. Can't imagine the screw holes with screws installed, and covered with lap sealant, would be anywhere near the leak potential that the 1+ square foot hole for the fan itself would be. JMHO.
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Old 11-16-2012, 02:03 PM   #7
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The screws are there in the flange, lots of them. You are not removing enough of the Dicor to see them.
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Old 11-16-2012, 03:41 PM   #8
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I've never seen a vent that wasn't a 2 piece design, one half goes up from inside, the other half goes down over the first, the whole issue then gets screwed together with a bunch of sealant in there for good measure.

I agree with the above, dig in, they're down there somewhere.
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Old 11-16-2012, 04:19 PM   #9
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Not where I can get a picture for a few days but I will. They are not there!
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Old 11-16-2012, 04:44 PM   #10
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Not where I can get a picture for a few days but I will. They are not there!

Dumb question maybe, but are you sure it is an actual "Fantastic Fan" brand?
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Old 12-12-2012, 04:03 PM   #11
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I am reviving this post as I have finally come to a conclusion about how to handle it. I had taken the brackets and "Glued them in place with the roof sealant and walked away from it for a month. Not secure enought for me! I also called Fantastic Vent folks with no sucess until today. (My battery phone always died before my turn in the lineup occured) The Model that was installed in my Wnnebego is a type that is actually clamped in place and there are no screws or screw holes available to me. Yes it is Definitly a Fantastic Fan. Their solution is to set the cover in place, mark the location of the brackets, Drill the holes, fill with caulk, then screw it down. They expect the fans hole was framed out by Winnebago and the wires for the power will enter from the hinge side so I should not drill into any problems. Drilling into the roof of a new MH is scary. A bit like drilling into the bottom of a boat!
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Old 12-13-2012, 10:22 AM   #12
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Larry, thanks for posting your findings and solution. Use caution with the drill depth and screw length and I'm sure you'll be fine.
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Old 12-14-2012, 03:23 PM   #13
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I have installed four covers and none had to remove screws. They came with L shaped brackets that screwed to the side of the fan box and the cover set on top of the bracket. No sealing required and absolutely no holes in the roof.
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Old 12-14-2012, 04:13 PM   #14
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Quote:
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...L shaped brackets that screwed to the side of the fan box and the cover set on top of the bracket. No sealing required and absolutely no holes in the roof.
EXACTLY my experience!
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