Screws work best and they even give them to you in the package. I used stainless ones when I replaced the FF with a Maxx-Air fan and added a second in the dead vent. Don't be stingy with the sealant (I used SikaFlex) and run a nice bead or two to bed the unit on to before setting it in to place. Then cover all of the screws and the outer seam where it joins the roof.
I sure don't want to be the person whe tries to remove mine .
it's an airstream use oly.rivets and vulkem under flange wipe off excess vulkem with rag and mineral spirits then spray with clear poly urethane. screws will start you on a slippery slope though i have noticed jackson cen. is using a lot more nowdays. how are existing vents attached? screws are a lot quicker & easier.
Just be sure to wear clothes that you are not fond of. When I was done using Vulkem, I was faced with the choice of washing them in 20 gallons of mineral spirits, or tossing them. I hear the garbage men are still trying to get my clothes unstuck from inside their truck.
__________________
Terry Important safety tip: Battery acid + baking soda= volcano...
AIR#2611
I hope that Airstream's workmanship in your trailer is better than it was in mine.I installed a Fantastic fan last week, and when I had removed the old vent I found that the cutouts in the roof and ceiling were off-set by 3/4 of an inch.
If you bought the "high profile" version you may also find that the mounting flange screwhole locations don't match the original.
Good luck I hope you don't find too many surprises.
__________________ John
If you need to turn on your air conditioner,you've gone too far south!
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