IVent ROTO ATTIC Oblong - Active Attic Vent for Metal Exposed Fasteners Roofing with RIB profile 3/4" high.

These vents are amazing. Only takes a tiny breath of a breeze to activate the fans. Extremely smooth action. They are so easy to install (and level) grandma could do it. She might even volunteer to do it for you, but fear not, she won’t have any trouble at all. Strap a tool belt on her and send her up to the roof! Drink a beer while you watch from below. Fans work great and they never allow rain or snow to get in, I’ve already been through a Montana blizzard and numerous torrential downpours and not a drop gets into my attic. 5 stars for this one, great design and function.