Universal RAI-J™ Positive Displacement Blower

The ROOTS™ patented Universal RAI-J™ WHISPAIR™ blowers are heavy duty rotary units featuring a compact, sturdy design, engineered for continuous service when operated within speed and vacuum/pressure ratings.

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Features

Detachable steel mounting feet
Rigid one-piece cast-iron casing
Anti-friction bearing
Splash oil lubricated spur timing gears
Connections in standard pipe sizes
Ground steel shafts
Straight, precision machined two-lobe impellers

Engineering Resources

uraij_drwg_pcurve.pdf,
uraij_drwg_vcurves_imp.pdf,
uraij_drwg_dimensionimp.pdf,

Warranty

The Warranty Policy and Procedure WP-5020 presents an exception condition to the standard General Terms of Sale, GTS-5001, warranty statement for the following products:URAI, URAI DSL, URAI-J and URAI-J DSL in gear diameters of 2-1/2 - 7 inch. RAM and RAM-J in gear diameters of 4-1/2 - 6 inch. RAM-X all models. RCS and RCS-J in gear diameters of 7 and 8 inch. EasyAir 8000 all sizes. EasyAir X2 models 50, 65, 100, 150, 200, 250 and 300.

wp_5020_rev7.pdf,
gts_5001_020107.pdf

Operating Principle

Two figure-eight lobe impellers mounted on parallel shafts rotate in opposite directions. As each impeller passes the blower inlet, it traps a finite volume of air and carries it around the case to the blower outlet, where the air is discharged. With constant speed operation the displaced volume is essentially the same regardless of pressure, temperature or barometric pressure. Timing gears control the relative position of the impellers to each other and maintain small, but defined, clearances. This allows operation without lubrication being required inside the air casing.

rotary_lobe_blwr_princ.pdf

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