These 16 gauge galvannealed steel access doors are fire rated for 1-1/2hours. They are installed over cleanout plugs, valves, controls or equipment concealed in walls and ceilings. The door is sprung to automatically close and is fitted with a spring latch to keep it closed. The frame is equipped with both masonry anchors and bolt holes to facilitate installation in all types of wall construction. These doors are available in configurations from 8” (152) sq. to 36” (915) x 48” (1,219) and are delivered primed and ready-to-paint. The larger sizes permit human entrance to utility and attic spaces.