United States Air Force portable pressure suit ventilation unit, measuring 8.5 x 13 x 12, featuring a metal tag on the top, “Ventilating Unit, Pressure Suit, Hand Portable, Stock No. RX4120-977-2989-S030, Serial No. PPS 241, Part No. 62A79-E1.” The top of the unit bears an “On-Off Flow Control” knob and “Hot Day—Cool Day” selection lever. In fine condition.
