The plastic access panel is designed to provide easy access to walls & ceilings. The high impact styrene plastic with U.V. stabilizers will not fade or corrode. All units except the 14x29 are hinged with a removable door panel feature. White Finish. 9-3/4"W x 9-3/4"H Outside Flange Dimensions. 8"W x 3/4"D x 8"H Return Flange Dimensions.