Models 0840-6, 0850-2L/R, and 0855-2L/R ultra-low leakage plenum access door provides easy access to larger plenums and equipment housings and is suitable for use in high, medium or low pressure applications. Design features include positive seal gasketing and insulation which provide assured low-leakage performance. The die-formed frame, hinged door and die-cast closure handles provide extra strength and maximum operational convenience. Thermal break 0850 and 0855 Series models available.