universal flush access door (stainless steel) for walls & ceilings. Designed for installation in all types of flush surfaces. This unit is good for exterior applications or areas where corrosion or moisture is a concern. 2 latches. Stainless steel finish. 17-5/8″w x 17-5/8″h outside flange dimensions. 16-1/4″w x 1-1/4″d x 16-1/4″h return flange dimensions.