We have a helpful comparison chart of the Roots Dresser Series URAI Blowers and the Sutorbilt California Legend Blowers. Roots Universal RAI Universal RAI blowers are heavy duty rotary blowers designed and constructed of a cast iron casing, carburized and ground alloy steel spur timing gears and secured to steel shafts with a taper mounting and locknut, and cast iron involute impellers. The URAI features thrust control, with splash oil lube on the gear end and grease lube on the drive end. The Sutorbilt rotary positive displacement blower has two figure eight impeller rotating in opposite directions. This entrapment occurs four times per revolution, moving the entrained air around the case to the blower outlet.
Timing gears position the impellers in relation to each other.
To control the speed of the blower a set of sheaves is supplied with each blower motor unit. The size sheave selected shall match the rpm's needed by the blower to achieve it's rated capacity. The TEII fiberglass multipurpose all weather enclosure is tough, light weight, non-conductive, corrosion resistant, maintenance free and easy to install. The enclosure is designed to enhance the installation of the blower motor unit in the most economical, accessible manner. The TEII unit protects your equipment with strong construction and lockable hoods.