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im not a believer in the old frog skinz I really don't feel they let all that much air through and if there wet well even less
I am not familiar with the exact shape a vent needs to be, but I have cut the some abs plastic sheet to the size I need and used two layers of regular fiberglass screen to filter out most of the snow. I just used hot melt glue to hold the screen to the back of the abs, then attached the piece to the outside.