DUCT ACCESS DOOR, DOOR HEIGHT 19 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 16, OBSERVATION PORT MATERIAL STEEL, ROUGH OPENING HEIGHT 16 IN, ROUGH OPENING WIDTH 20 IN, STANDARDS NFPA 96 COMPLIANT, UL LISTED, PRODUCT TYPE ACCESS DOOR