Atlas Copco’s ZS screw blower range is available with integrated variable speed drive (VSD) and features ISO 8573-1 Class 0 certification for oil-free air. The ZS range provides an average of 30 percent more energy savings than conventional lobe blowers in a wide range of low pressure applications, such as aeration in the wastewater treatment process. With the new addition, the ZS range now offers flow rates ranging from 50 CFM to 5,000 CFM.