Abstract: In order to improve storability and applicability of active air supply/exhaust personal bio-protective equipment in alpine regions, an experiment was conducted. Firstly, typical equipment, including positive pressure protective hood, negative pressure protective hood and positive pressure protective suit at home and abroad were selected and put in an outdoor environment at -35--45 ℃ before they were reheated after storage for 10 hours. Then, in an outdoor environment at -20--30 ℃, their key technical indicators, such as noise, pressure difference, continuous working time, were tested. Finally, applicability of the equipment was measured for low temperature operation after volunteers actually wore them. The results show that the selected domestic positive pressure protective hood, negative pressure protective hood and positive pressure protective clothing cannot work normally after being stored at -35--45 ℃ for 10 hours, but they can resume normal function after reheating and charging. Meanwhile a certain positive pressure protective hood from overseas becomes brittle and damaged in the same case, and cannot start normally after reheating and charging. In terms of environment at -20--30 ℃, the low-battery alarm of domestic protective equipment is obviously advanced after starting up, but it can continuously work for more than 6 hours. In a low temperature environment, problems such as fogging of face screen and cold wind stimulation will reduce wearers' comfort and operation ability.

Key words: active air supply/exhaust, personal protective equipment, low temperature adaptability, positive pressure hood, negative pressure hood