... weight, comfortable in wearing, airtight, high filtrating efficiency, huge air flow, easy in operation with remarkable positive pressure, service life ... filtrating precision;2) 99.97% filtrating efficiency;3) air flow 170L/Min;4)12 hours consecutive working battery, (rechargeable Lithium Battery ). ... of PRF-101 respirator: 900g;7)Weight of M1 air supply hood: 200g.The respirator allows people to work ...