Hoffman 40 HP centrifugal exhauster blower, Model number 38305B1, 6" diameter in/out, driven by 40 HP motor. Serial number 0578077, order number GS-28729. Rated up to 2,280 CFM, 12 PSI, 13.8"Hg. Blower has (9) stages, 3,550 RPM operating speed. Previously used to convey powder material at food processing facility. Good condition.