Karp Duct Doors (KHD) are furnished with hinges and cam latch. Frames are easily attached to duct with notched knock-over tabs.
On door sizes of 12x12 inches and smaller, door will be 24 gauge galvanized steel.
On door sizes of 14x14 inches and larger, door will be 22 gauge galvanized steel.
Frame is 22 gauge galvanized steel.
Hinge is aluminum, continuous piano. (Or omit hinge and supply with double cam latches)
Door is filled with 2" thick fiberglass insulation compressed into 1". R factor = 7.7
Gasketing between door and frame is 1/2" thick by 1/8" wide closed cell neoprene gasketing.
Cam latches are zinc plated steel - self-tightening and hand operated.
Back of frame has 5/8" notched knock-over edges.