Atlantic Blowers' AB-1902 Three Phase/Double Stage Regenerative Blower can be used for various pressure or vacuum applications. The AB-1902 produces a maximum flow of 812 CFM. The maximum pressure and vacuum is 185 inH2O and 177 inH2O respectively.The AB-1902 has a power output of 40 HP (29 kW) with speeds of either 3000 or 3600 RPM (50/60 Hz dual frequency). The voltage is 220-275Δ/380-480Y with an FLA rating of 92.0Δ/53.2Y. Measuring at a distance of 3 ft. the blower will produce a noise level of 84 dbA. The inlet/outlet connection size is 4.00" female NPT.