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Old 07-28-2014, 10:48 AM   #1
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Fantastic Fan Leaks

I installed Fantastic Fans about three years ago and the gray mounting flange has cracked on both of them. It seems like the roof expanded on hot days and created cracks in the flanges running perpendicular to the flange (that is the cracks run from the outside edge of the flange toward the inside edge. The cracks exist in the vertical part of the flange that is hidden by the interior trim bezel, too. Needless to say, when it rains, they leak. I've been in SoCal until now so it hasn't been a real issue.

Anyone else have this problem?
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Old 07-28-2014, 11:07 AM   #2
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Quote:
Originally Posted by jmpratt View Post
I installed Fantastic Fans about three years ago and the gray mounting flange has cracked on both of them. It seems like the roof expanded on hot days and created cracks in the flanges running perpendicular to the flange (that is the cracks run from the outside edge of the flange toward the inside edge. The cracks exist in the vertical part of the flange that is hidden by the interior trim bezel, too. Needless to say, when it rains, they leak. I've been in SoCal until now so it hasn't been a real issue.

Anyone else have this problem?
It is more common than you may think.
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Old 07-28-2014, 11:11 AM   #3
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I had several problems with FF's. I tried a few different ways to install them and ditched the countersunk head screws on day one. I think the plastic frame is a terrible design and will skip them entirely on the current project trailer. It could be the temp fluctuations here as it does go very cold and pretty hot in short time frame. Not a FF Fan anymore.
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Old 07-28-2014, 11:47 AM   #4
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My housings were cracked when I received them. They replaced them. So far, so good. But......
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Old 07-28-2014, 11:58 AM   #5
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You could stop drill the cracks in the frame and put some sealant on there. Any kind that adheres to plastic should work.
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Old 07-28-2014, 02:54 PM   #6
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If it is plastic IT WILL CRACK. This is why I think taking out the original aluminum housed vents is silly. My original vents are aluminum with an aluminum lid. The lid has a plastic insert that was cracked and it was replaced with solid aluminum. I want to add some computer cooling fans to my vents but I have not gotten around to it. The caulk tape stuff that is about 2 inches wide might cover the cracked areas and the screws.

Perry
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Old 07-28-2014, 08:17 PM   #7
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You could stop drill the cracks in the frame and put some sealant on there. Any kind that adheres to plastic should work.
I have stop drilled them, covered them with Vulkem, and lastly used that spray on rubber coating they sell on TV. They keep leaking!
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Old 07-28-2014, 08:21 PM   #8
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Originally Posted by perryg114 View Post
If it is plastic IT WILL CRACK. This is why I think taking out the original aluminum housed vents is silly. My original vents are aluminum with an aluminum lid. The lid has a plastic insert that was cracked and it was replaced with solid aluminum. I want to add some computer cooling fans to my vents but I have not gotten around to it. The caulk tape stuff that is about 2 inches wide might cover the cracked areas and the screws.

Perry
I covered them duct tape for a temp fix. I think I'm going to make some aluminum flashing that will cover the whole plastic part and vulkem them on.
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Old 07-28-2014, 08:58 PM   #9
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Fantastic problem

Re-post
I'm pretty well disappointed in the Fantastic fans. I wouldn't use them again. I installed 3 in 2010. I installed them using the supplied gasket and sealed them with premium silicone as directed. The rear fan base cracked at the mounting screw location the second winter. By 2012 two were leaking at the cracked bases. I removed the silicone and sealed the bases with Vulkem. 2013 none leaked. This spring all three were leaking.

I investigated and the Vulkem was tight but the bases were all cracked from the flange to the top. Two had 4 cracks each and one had 2 cracks. When I washed the cracks with acetone and globbed Vulkem on the cracks two of the vents are still leaking from cracks under the hinges.



Read more here:
http://www.airforums.com/forums/f516...ml#post1462168

And here:
Fantastic Fan bases all cracked and leak - Airstream Forums
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Old 07-28-2014, 09:05 PM   #10
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Hmmm interesting to note, all who have posted have narrow body ASes. Mine are fine and they are 7 years old. On my flat top old SOB, they were 17 years old when I sold it. None cracked on either unit.
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Old 07-28-2014, 09:22 PM   #11
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I tossed the countersunk factory supplied screws and used pan head SS screws with a stainless washer under the head. This spreads the pressure over a much larger area. I also tossed the gasket and just seated the flange in a thick bead of vulkem. A dab of vulkem over each screw head and 4 years later so far no cracks or leaks.
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Old 07-28-2014, 09:30 PM   #12
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Do any of the fan makers offer a curved curb? I know FF has curved interior pieces, but what about outside?
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Old 07-29-2014, 06:20 AM   #13
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That's exactly what the cracks in my flange look like.
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Old 07-29-2014, 06:40 AM   #14
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Has anyone experienced this cracking with Maxxfans? TWind, i installed my MFs the exact same way except for the washers. Good idea. I just installed them this spring so no problems so far.
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