Ortech CAD-300 Access door to inspect and maintain circular ventilation ducts

Inexpensive curved access door Polyamid knobs ensure a quick removal/re-installation of the door without the need for any tools Shape allows the back plate to be passed through the duct openings, and the neoprene gasket on the back plate Strengthening ribs, galvanized steel spring, zinc plated volt, with neoprene gasket on the back plate for a tight seal Grants easy access into sheet metal ductwork systems for resetting dampers, cleaning filters, or regular maintenance