October 25, 2005 - Based on Roots technology, SN Series is manufactured in cast iron with mechanical shaft seal and internal piston ring seals as standard. Depending on model, boosters can be supplied with motors, or variable speed drives and couplings and are available to UL, CSA, or CE Standards. Chemical versions are certified to meet ATEX requirements. Boosters are suited for steel degassing, metallurgy, coating, electron beam welding, and process engineering industries.