Builders Edge 120023422028 Vent, Forest Green The Builders Edge 22" X 34" Half Round (Net Free Venting Area: 100 sq in	) provides added architectural detail with their wood grain finish and sharp distinctive characteristics Installation is easy with our wide nailing flange, leveling lines, and adjustable stop gauge Our patented snap-on trim ring hides rough cuts and reduces installation time, while providing a finished appearance once the vent has been installed