Duct Access Doors sales@airsync.eu View more products Curved Access Door CAD Request more information Used for Round Duct. Sandwich Flat Access Door FAD Request more information Tab Access Door RAD Request more information Insulated Flat Access Door ISR Request more information Curved Access Door QAD Request more information Made of Galvanized steel Quick installation and removal by the knob Air-tight PU gasket on inner panel Used for Round Duct