Builders Edge 120033030001 Vent, White The Builders Edge 30" Round w/ Wide Ring and Keystones (Net Free Venting Area: 50 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