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RF
Outdoor air conditioner units mounted on white building wall in row-stock-foto
RM
. Railway mechanical engineer . rom the fans into the shelter bays on either side ofthe sand blast room. The sand blast machines are fitted with -3^-in. or /2-in. nozzles,and when supplied with air at a pressure of 80 lb per sq. in.will clean from four to eight square feet of surface per minute,or a total of 8 sq. ft. to 16 sq. ft. per minute for both machines.The apparatus is designed to use any abrasive material, pref-erence being given to metal abrasives as being cheaper anddecreasing the amount of dust created. SMALL STEAM DRIVEN AIR COMPRESSORUNIT The demand for higher efficiency and the-stock-foto