The ADP-20 air driven Free-Air Pump supplies air to four hood-style or six half or full face mask respirators approved to operate at 25 psig or less. Intrinsically safe and offering an inlet drive pressure of 95 psig, air flow is 30 CFM at 5 psig. The ADP20 is also compatible with the Bullard Frigitron 2000 climate control devices (for one worker).