Door for Duct Access with NO HINGE has an insulated door panel, along with the gasketing betwwen the door and frame assures a tight seal without obstruction in the air system. Unit comes with extra – self tightening, hand operated cam latch(es) making the door panel completely removable. Galvanized steel material with mill finish. 4 Latches. Silver Finish. 18″W x 18″H Outside Flange Dimensions. 16-3/4″W x 5/8″D x 16-3/4″H Return Flange Dimensions.