Steel, Fire Rated Access Door for Walls & Ceilings. With an insulated door panel, this unit has a UL 90-minute label for walls with a maximum temperature rise of 250 degrees after 30 minutes. This unit is also test up to 3 hours in ceiling applications and carries a Warnock Hersey rating for ceilings. Self Latching, 2 Latches. White Finish. 26″W x 38″H Outside Flange Dimensions. 24-1/8″W x 36-1/8″D x 2-9/16″H Return Flange Dimensions.