Roots Universal RAI DSL Rotary Positive Displacement Blowers

Roots Universal RAI DSL Rotary Positive Displacement Blower
MODEL: Roots Universal RAI DSL Rotary Positive Displacement Blower

The Roots Universal RAI ™ DSL Blowers (Dual Splash Lube) is available in a variety of models and sizes.

  • They feature "universal" mounting feet which allow them to be mounted in four different configurations.

This model features Dual Splash Lubrication (DSL) on both the gear end and drive end.

Dual splash lube provides:

  • More oil capacity
  • Cooler operation
  • Greater reliability
  • Available with metric drive shaft and pipe connections


  • Engineered for continuous service when operated in accordance with speed and pressure ratings.
  • Heavy duty rotary blowers designed with detachable, rugged steel mounting feet that permit easy in-field adaptability to vertical or horizontal installation requirements.
  • Units can be easily adapted to any of the four drive shaft positions: right, left, bottom, or top. 
  • The compact, sturdy design is engineered for continuous service when operated in accordance with speed and pressure ratings. 
  • Consists of a cast iron casing, carburized and ground alloy steel spur timing gears secured to steel shafts with a taper mounting and locknut, and cast iron involute impellers.
  • Oversized antifriction bearings are used, with a cylindrical roller bearing at the drive shaft to withstand v-belt pull.

The Universal RAI DSL (URAI DSL) blower features splash oil lubrication on both the gear end and drive end.

  • The drive end has two shaft-mounted oil slingers and the gear end has roots’ exclusive “figure-eight” gearbox design that improves oil distribution to maximize gear and bearing life.
  • Sight glasses (3/8”) are provided for accurate oil level confirmation.
  • After testing, the unit is sprayed with a protective paint and boxed or skid mounted for delivery.

Frame Sizes

  • 32 URAI DSL
  • 33 URAI DSL
  • 36 URAI DSL
  • 42 URAI DSL
  • 45 URAI DSL
  • 47 URAI DSL
  • 53 URAI DSL
  • 56 URAI DSL
  • 59 URAI DSL
  • 65 URAI DSL
  • 68 URAI DSL
  • 615 URAI DSL


  • Driver
  • Relief valve
  • Inlet and discharge silencers
  • Inlet filter
  • Check valve
  • Extended base
  • V-belt or flexible coupling
  • Drive guards


  • Roots URAI DSL blowers are warranted for two years plus an additional 6 months for shipping and construction where required.
  • Roots synthetic oil assures top performance and warranty acceptance for lubricants.

Design and Construction Features

  • Steel detachable mounting feet
  • Rigid one-piece cast iron casing
  • Anti-friction bearings
  • Splash oil lubricated spur timing gears
  • Splash oil lubricated drive end bearings
  • Connections in standard pipe sizes
  • Balanced, precision machined bi-lobe impellers
  • Ground steel shafts 


  • Flow Range: 40 CFM to 1641 CFM / 55- 565 ICFM / 94-960 m179/Hr
  • Pressure Range: 1 psi to 15 psi (No more than 896 mbar)
  • Vacuum Range: 1" to 16" Hgg  (Dry) (No more than 16 INHgV/539 mbar)
  • Horsepower: 0.5 - 37 bhp (0.4 - 28 kw)

Contact Thomas Conveyor today and speak with our pneumatic automation engineers about the ROOTS URAI DSL Rotary Positive Displacement Blower or click on the contact us for more information. 

QUESTIONS? CALL 844-220-0086