DUCT ACCESS DOOR, DOOR HEIGHT 15 IN, DOOR SHAPE RECTANGULAR, DOOR WIDTH 23 IN, LATCH TYPE THUMBSCREWS, MATERIAL THICKNESS 16 GA, MAXIMUM TEMPERATURE RATING 2,300 DEGREES F, MOUNTING STUD LENGTH 1 IN, NUMBER OF MOUNTING STUD 14, OBSERVATION PORT MATERIAL STEEL, ROUGH OPENING HEIGHT 12 IN, ROUGH OPENING WIDTH 20 IN, STANDARDS UL LISTED, PRODUCT TYPE ACCESS DOOR, FOR MEDIA TYPE GREASE