Sutorbilt (Fuller Company) Rotary Positive Blower, Model: 5M-B. Approximate for displacement blower is 542 CFM, maximum pressure 13 PSI, maximum rotor RPM 2850, maximum vacuum 416 hg. Includes 4" FPT inlet and outlet. Driven by 25 HP, 1760 RPM, 208-230/460V, 3/60 Hz motor. Serial number A-137864.