TRI-BUILT® CUTTINGEDGE Gable Vents offer key features that have become the benchmark in the industry. Installation is easy with our wide nailing flange, leveling lines, adjustable stop gauge and snap-on trim ring. The snap-on trim ring hides rough cuts and reduces installation time, while providing a finished appearance once the vent has been installed. Each gable vent has more Net Free Ventilation Area for optimal venting than industry standards. It’s backed by a Limited Lifetime warranty too!