Duct Access Door, Door Height 8 in, Door Shape Square, Door Width 8 in, Latch Type Thumbscrews, Material Thickness 16 ga, Maximum Temperature Rating 2,300 Degrees F, Mounting Stud Length 1 in, Number of Mounting Stud 4, Observation Port Material Steel, Rough Opening Height 6 in, Rough Opening Width 6 in, Standards UL Listed, Product Type Access Door, For Media Type Grease