Duro Dyne HSAD & CSAD access doors feature a self stick frame for easy application. Simply size and cut the hole, peel the release paper off the frame, press the door onto the ductwork and secure with screws. They are easy to position with no frame “dove tails’ to align and bend. Self Stick Access Doors are manufactured of 24 gage galvanized steel and feature a one inch wide gasketed frame, 1’’ thick fiberglass insulation and are supplied with self drilling screws. They have been tested to 10’’SP with minimal leakage when properly installed.