Duct Access Door Door Height 12 in Door Shape Rectangular Door Thickness 1 1/8 in Door Width 16 in Fire Rating Not Rated For Nominal Duct Diameter 19 in 20 in Hinge Style None Insulation Material Not Applicable Latch Type Thumbscrews Material Thickness 20 ga Maximum Temperature Rating 2 300 Degrees F Mounting Stud Length 2 in Number of Mounting Stud 2 Observation Port Height Not Applicable Observation Port Material Steel Observation Port Width Not Applicable