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Roots URAI Series

The Universal RAI (URAI) is Roots' classic bi-lobe rotary PD blower, engineered for versatile low-to-mid pressure applications from wastewater aeration to pneumatic conveying. Available in 17 frame sizes ranging from 68 to 2,460 ICFM, URAI blowers deliver compact, durable cast-iron construction with easy four-position mounting adaptability. These workhorse units operate at pressures to 15 PSIG and vacuums to 16 in.Hg, with grease-lubricated drive end and oil-lubricated gear end.

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New to Roots blowers? See our Industrial Rotary Lobe Blower overview

Roots Blowers

URAI Models (17)

Roots URAI 22 — Roots URAI positive displacement blower

Roots URAI 22

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

68 ICFM at 12 PSIG

Roots URAI 24 — Roots URAI positive displacement blower

Roots URAI 24

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

148 ICFM at 7 PSIG

Roots URAI 32 — Roots URAI positive displacement blower

Roots URAI 32

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

142 ICFM at 15 PSIG

Roots URAI 33 — Roots URAI positive displacement blower

Roots URAI 33

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

195 ICFM at 12 PSIG

Roots URAI 36 — Roots URAI positive displacement blower

Roots URAI 36

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

330 ICFM at 7 PSIG

Roots URAI 42 — Roots URAI positive displacement blower

Roots URAI 42

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

68–2,460 ICFM across frame sizes 22–718

Roots URAI 45 — Roots URAI positive displacement blower

Roots URAI 45

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

395 ICFM at 10 PSIG

Roots URAI 47 — Roots URAI positive displacement blower

Roots URAI 47

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

523 ICFM at 7 PSIG

Roots URAI 53 — Roots URAI positive displacement blower

Roots URAI 53

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

334 ICFM at 15 PSIG

Roots URAI 56 — Roots URAI positive displacement blower

Roots URAI 56

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

580 ICFM at 13 PSIG

Roots URAI 59 — Roots URAI positive displacement blower

Roots URAI 59

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

857 ICFM at 7 PSIG

Roots URAI 65 — Roots URAI positive displacement blower

Roots URAI 65

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

526 ICFM at 15 PSIG

Roots URAI 68 — Roots URAI positive displacement blower

Roots URAI 68

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

845 ICFM at 14 PSIG

Roots URAI 76 — Roots URAI positive displacement blower

Roots URAI 76

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

765 ICFM at 15 PSIG

Roots URAI 615 — Roots URAI positive displacement blower

Roots URAI 615

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

1,583 ICFM at 7 PSIG

Roots URAI 711 — Roots URAI positive displacement blower

Roots URAI 711

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

1,413 ICFM at 10 PSIG

Roots URAI 718 — Roots URAI positive displacement blower

Roots URAI 718

Bi-lobe rotary positive displacement blower for general aeration and pneumatic conveying

2,316 ICFM at 7 PSIG

Need a Roots URAI quote?

Authorized Roots distributor since 1961. Tell us your CFM, pressure, and application — we'll size the blower, quote the package, and support it for the life of the unit. See our Roots service center.

Request a Quote Call (800) 955-6188

URAI Series Specifications

Capacity Range: 68–2,460 ICFM across frame sizes 22–718
Max Pressure: 15 PSIG
Max Vacuum: 16 in.Hg
Max Speed: 5,275 RPM (smaller frames 22–24); 1,090–2,850 RPM (larger frames)
Connection Sizes: 2.0 in. FPT (models 22–36) to 8.0 in. flange (model 718)
Gearing: Carburized and ground alloy steel spur gears

Typical Applications

Wastewater aeration
Pneumatic conveying
Vacuum applications
Gas movement and transport
Industrial air supply
HVAC system support

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