Duct Access Door, Door Height 7 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 10, Observation Port Material Steel, Rough Opening Height 5 1/2 in, Rough Opening Width 21 1/2 in, Standards NFPA 96 Compliant, UL Listed, Product Type Access Door