Nailor Model 0800-5 Access Door was designed for use in higher pressure applications, yet it is suitable for use in medium and low pressure applications where the security of a positive pressure type access door is desired. The design of the 0800-5 is such that as positive static pressure in the duct increases, the force exerted on the door compresses the seal, eliminating any leakage possibilities. The ultra-low leakage design features include rugged die-formed construction, safety handles for assured opening and closing, and wing nut fasteners for secure attachment and alignment.