1994 Lightning Stainless Steel Pneumatic Mixer. Model: XJA-100. Portable clamp on mixer with a 1 hp pneumatic motor. Final rpm: 290 (tested). Air requirements: 85 psig with a flow of 30 cfm. Impeller diameter: 1 ft. 1/2 in. Air inlet: (1) 3/8 in. push on air hose fitting. Shaft length: 3 ft. 10 in. Shaft diameter: 3/4 in. The benefits of a pneumatic mixer include reduced heat buildup and spark free operation. Estimated weight: 65 lbs. Overall dimensions: 9-7/8 in. L x 11-1/2 in. W x 4 ft. 11-3/4 in. H. (ACN51a).