Give an elegant look to the drainage channel with the Ville slot design trench drain grate. This decorative grate has an intricate design that allows water to flow through while blocking leaves and debris from entering the drainage system. The drain cover features an open surface area of 24.8 sq. in. per meter and 76 GPM flow rate. Rated for NDS Class E loads when properly installed. ADA compliant and heel-proof drainage grate. Use two half-meter (19.69 in.) grates to cover one BG-FILCOTEN 100 4 in. trench drain. Iron grates are painted black to inhibit rust; over time, it will form a protective iron-oxide patina.