The streamlined design of the Via drain grate protects the drainage system by blocking leaves and debris while water drains away. This decorative grate adds aesthetic appeal to any environment. Rated for NDS Class D loads when properly installed. The ductile iron drain cover has an open surface area of 153.0 sq. in. per meter and flow rate of 470.0 GPM per meter. Grate is both ADA compliant and heel proof. Two half-meter (19.69 in.) grates will cover one BG-FILCOTEN 300 12 in. trench drain. Iron grates are painted black to inhibit rust. Over time, it will form a protective iron-oxide patina.