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Old 08-22-2012, 08:24 AM   #1
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1975 31' Sovereign
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Fantastic Fan Installation

I have been searching the forum for the best method to install new Fantastic fans on my "75 Sovereign but can't seem to find anything. I'm not sure if I should use the screws that came with the fan or rivets. If I use screws, I'm concerned that the exterior skin alone won't be enough for the screw to grab. Should there be a backer installed under the skin or is it better to use rivets? Also, should I use butyl tape or the tempro 635?
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Old 08-22-2012, 08:33 AM   #2
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I used the screws and Vulkem. You will have to square the round corners of the vent hole. Be careful not to cut into the wiring harness next to the hole. Add a screw or 2 to the inner flange to get it to lay flush to the ceiling.
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Old 08-22-2012, 08:33 AM   #3
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You should make or use a 1 3/4" "C" channel to reinforce the opening between the inner and outer skins, don't want a depression to collect water, use the Sikaflex 221, quicker cure time and a smoother look. The screws are your best option as you can control the torque on a screwgun, using the rivets may crack the plastic frame of the Fantastic Fan.
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Old 08-22-2012, 08:44 AM   #4
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Quote:
Originally Posted by Greg@AirLA View Post
You should make or use a 1 3/4" "C" channel to reinforce the opening between the inner and outer skins, don't want a depression to collect water.
Greg
That could not hurt, but I did not find it necessary. No depressions. Now on an AC you will need some cross reinforcement.

Also, you can throw out the foam gasket.
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Old 08-22-2012, 08:58 AM   #5
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The ones I have done, I used the butyl tape, and screws, Trempro on the screws. No C channel, no leaks.
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Old 09-14-2012, 12:23 AM   #6
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Boilermaker.... how did the install go? Putting two in my 74 sovereign.
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Old 09-14-2012, 07:52 AM   #7
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You might want to call FF. I seem to recall reading somewhere (can't remember if it was on the forum, or something that FF published) that they now have curved trimout pieces for the interior.
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Old 09-14-2012, 08:33 AM   #8
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Yup they already sent my curved ones!
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Old 09-18-2012, 05:24 AM   #9
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Texasbound

Quote:
Originally Posted by texasbound View Post
Boilermaker.... how did the install go? Putting two in my 74 sovereign.
Texasbound - I installed one of the three new vents. I used Tempro 635 under the vent and the screws provided with the fan. I also added screws in between the predrilled holes in the fan. The screws didn't grab the exterior skin as well as I would have liked. It is also easy to strip the skin if your not careful. On the next 2 fans I will use rivets. I think they will be tighter and easier to install.

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Old 09-18-2012, 07:31 AM   #10
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Installing the fan is fairly easy. As mentioned you have to cut the opening square. Instead of channel I used a pce of wood between the skins. Sealant under the flange and screw throught the skin and into the wood. Also put a few screews through the inner skin into the 'bottom' of the wood. Creates a
stiff, strong watertight seal.
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