Defend your drainage system by preventing leaves and debris from entering and potentially clogging drain pipes with the trench drain grate. This galvanized steel drain cover has a mesh design and boasts an open surface area of 147.0 sq. in. per meter, and an impressive 451 GPM flow rate. Rated NDS Class B when properly installed; also ADA compliant. Use two 1/2 meter (19.69 in.) grates to cover one BG-FILCOTEN 100 4 in. trench drain. Also available in a 1 meter (39.37 in.) size.