Atlantic Blowers' AB-502 Three Phase/Double Stage Regenerative Blower can be used for various pressure or vacuum applications. The AB-502 produces a maximum flow of 145 CFM. The maximum pressure and vacuum is 169 inH2O and 141 inH2O respectively.The AB-502 has a power output of 3.5 HP (2.55 kW) with speeds of either 3000 or 3600 RPM (50/60 Hz dual frequency). The voltage is 220-275Î”/380-480Y with an FLA rating of 9.5Î”/5.5Y. Measuring at a distance of 3 ft. the blower will produce a noise level of 69 dbA. The inlet/outlet connection size is 2.00" female NPT.