stainless steel access door that has been tested for air infiltration & water penetration. The door and frame are fully welded & gasketed. This access door is ideal for use in laboratories, clean rooms, operating rooms, etc… Comes in type 304 stainless steel with #4 satin polish finish. 2 latches. Stainless steel finish. 20-3/4″w x 20-3/4″h outside flange dimensions. 18″w x 18″d x 2″h return flange dimensions.