Duct/Shaft/Access Doors by Ahlada Engineers Limited are specialized steel doors designed for secure and reliable access to service and maintenance areas such as elevator shafts, duct works, and utility spaces in commercial and industrial buildings. They are engineered with a 1.20mm thick galvanized iron shutter skin and a shutter thickness of about 25mm, featuring honeycomb kraft pape... https://ahlada.com/products/duct-shaft-access-commercial-steel-door/