10-24-2014, 03:12 PM
I had one installed by contractor (808-966-5422) very pricey, but top of the line. They made a custom flashing which they stuck under the metal roof cap and extended down over the fan no caulking, no adhesive and no leaks as the water has no way to get under flashing. I am very happy with this and with good soffit vents, and radiant barrier I installed I was able to lower attic temperature by 6 degrees which may not seem much but it does help. Hopefully it will help with keeping mildew out of the attic also. Note! Does not help with high humidity days that's what the garden hose is for.
Regards
Regards