Builders Edge 120072430001 Brick Mold, White The Builders Edge 20 inch x 30 inch rectangular brick mold (net free venting area: 298 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