Full Face Gas Mask Electric Constant Flow Respirator Supplied Air Fed Facepiece. Electric Supplied Air Fed Full Face Gas Mask Constant Flow Respirator System. Product Name: Gas Mask Respirator. Air Supply Flow Rate. First gear: 62 L/min. Second gear: 74 L/min. About 5-7h per full charged. Fullly Charging time:about 3h. Equipped with portable power source mainly overcome the problems of big air in-taking resistance, difficulties in breathing, etc. Practical supplied fresh air respirator system. The filter can be used for benzene, acetone, alcohol, aniline, disulphide, paint and its derivatives. Use the air pump to transport the air to the mask. Allow to fix the air pump on your waist, so you are more close to the air source. Works or filter for.