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Patented universal RAI-J Whispair blowers are heavy duty rotary units in a compact, sturdy design engineered for continous service when operated within speed and vacuum/pressure ratings.

The basic model features a cast-iron casing with a computer-designed cast relief for noise and shock suppression, carborized and ground alloy steel spur timing gears secured to steel shafts with a taper mounting and locknut and cast iron involute impellers. Oversized anti-friction bearings are used, with a cylindrical roller bearing at the drive shaft to withstand V-belt pull. Detachable rugged steel mounting feet permit easy in-field adaptability to either vertical or horizontal installation requirements.

The universal RAI-J incorporates thrust control and has grease lube on the drive end and splash oil lube on the gear end. Roots exclusive "Figure 8" gearbox design improves oil distribution and lengthens bearing and gear life.