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FAN BLADES; 54" FAN BLADES; TYPE: DIRECT DRAFT; DIMENSIONS: 54" FAN, 21" BLADE LENGTH, 12" CORE DIAMETER; WITH TAPERED SLEEVE FOR 1-7/8" SHAFT DIAMETER WITH -0.004" MOUNTING INTERFERENCE; MATERIAL: CAST ALUMINUM; AIR VOLUME: 42,169 ACFM; 850 RPM; 12,016 FPM SPEED