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