The document describes rectangular access doors for air duct systems. It provides details on the construction of the IDE access door model, including a seamless mounting frame, double-walled insulated door, neoprene sealant, and safety chain. It also lists specifications for four standard size models of the access door and notes they are suitable for low, medium, and high air pressure systems. Installation instructions involve sticking a stencil, cutting the duct, fastening the frame, and sealing.