Open Area: 45.85 Sq inches Dimension: 13.8"l x 13.8"w x 1.5"h Meets Class A Load Requirements - Loads of 1-60 psi Recommended for pedestrian, bicycles and wheel chair traffic ADA Approved - Made in the USA The Storm Drain FSD-3017-GEB 12" Round Flat Grate for Drain Catch Basin is constructed of a High Density Polyethylene, with UV Protection to prevent fading and eliminate sun damage. With a unique grate pattern that not only increases flow, but blocks large debris from entering your drainage system this is a great solution for you next drainage project. Made in the USA.