Here low- silhouette exhaust or intake details including roof , curb cap factory assembled hinge hood letch with bird screen, transition duct full size of damper supply with hood, gravity backdraft dumper use on exhausted prefabricated roof curb, wood nailing strip including eliminate leaky joints while maximizing water protection with a one-piece molded base and built-in drip edge. These vents feature an attractive low profile design and fit 7" and 8" diameter ducts. They are rain screen-compatible via the extended base which compensates for the cavity between sheathing and cladding.