Protect the drainage system from clogging with the heavy-duty trench drain grate. This drain cover with bar design is made of ductile iron and rated for NDS Class E loads when properly installed. This grate boasts an open surface area of 150.0 sq. in. per meter and flow rate of 459.5 GPM. Use two half-meter (19.69 in.) grates to cover one BG-FILCOTEN 200 8 in. trench drain. Iron grates are painted black to inhibit rust. Over time, it will form a protective iron-oxide patina.