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    Roots URAI J Series

    The URAI-J adds Roots' proprietary WHISPAIR jet technology to the proven Universal RAI platform, delivering 3-5 dB noise reduction through controlled pressure equalization. The wrap-around plenum and jet ports meter discharge pressure in the direction of impeller movement, aiding rotation and reducing system shock. Available in 5 frame sizes (33, 36, 45, 47, 56), URAI-J blowers maintain the compact, durable bi-lobe design while achieving lower pulsation and improved efficiency for noise-sensitive applications.

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    URAI J Models (5)

    Roots URAI J 33 — Roots URAI J positive displacement blower

    Roots URAI J 33

    Bi-lobe URAI with Whispair jet porting for reduced pulsation and noise

    195 ICFM at 12 PSIG

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    Roots URAI J 36 — Roots URAI J positive displacement blower

    Roots URAI J 36

    Bi-lobe URAI with Whispair jet porting for reduced pulsation and noise

    330 ICFM at 7 PSIG

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    Roots URAI J 45 — Roots URAI J positive displacement blower

    Roots URAI J 45

    Bi-lobe URAI with Whispair jet porting for reduced pulsation and noise

    395 ICFM at 10 PSIG

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    Roots URAI J 47 — Roots URAI J positive displacement blower

    Roots URAI J 47

    Bi-lobe URAI with Whispair jet porting for reduced pulsation and noise

    523 ICFM at 7 PSIG

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    Roots URAI J 56 — Roots URAI J positive displacement blower

    Roots URAI J 56

    Bi-lobe URAI with Whispair jet porting for reduced pulsation and noise

    580 ICFM at 13 PSIG

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    Need a Roots URAI J 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.

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    URAI J Series Specifications

    Capacity Range
    195–580 ICFM across frame sizes 33–56
    Max Pressure
    15 PSIG
    Max Vacuum
    16 in.Hg
    Max Speed
    3600 RPM (models 33–45); 2850 RPM (models 47, 56)
    Connection Sizes
    2.0–4.0 in. FPT depending on frame
    Gearing
    Carburized and ground alloy steel spur gears

    Typical Applications

    • Noise-sensitive wastewater treatment facilities
    • Pneumatic conveying with lower pulsation
    • Industrial air supply requiring quiet operation
    • Applications adjacent to occupied spaces
    • High-frequency vacuum applications

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