RVG55BR Slant Galvanized Roof Vent, Brown, Heavy Duty Construction, 50 SQIN Of Net Free Area Per Piece, Used On 3/12 To 10/12 Roof Pitch, Large Nailing Flange, Double Beaded Collar With Locking Tabs, Base Dimensions Are 15-7/8" x 20-3/8", Opening Size Is 8-1/2" Diameter Opening.
