Rotary lobe blowers – Large packages up to 250 kW

True powerhouses with low maintenance requirement

With their uniform design concept, our large blower units can be individually configured and expanded to meet your needs. They are easy to maintain and operate, and are also available upon request for outdoor installation.

  • High-performance, energy-saving and low-maintenance blower packages with three-lobe blower blocks (models HB 1300 PI and 1600 PI)
  • Also available for nitrogen conveying applications (N versions)

Your advantages

  • Also for medium voltage:
    Mains voltage for drive motor up to 6,600 V.
  • Easy configuration and maintenance:
    If required, the units can be configured for variable speed operation. In case more power is needed or for scheduled maintenance work, the motor, transmission or block can be changed on-site with ease.
  • Low energy costs:
    The excellent air flow design and the separate sound enclosure fan motor ensure optimal cooling even at full power. The automatic belt tensioning device prevents transmission losses and therefore ensures maximum efficiency at all times.

Economical – thanks to low life cycle costs
Life-cycle costs

Our comprehensive approach guarantees optimal return on investment: Outstanding energy efficiency and maximum compressed air availability combined with a rapid response global service and support network.


Product details


Drive motor

Energy-saving blower motor

  • Brand-name product
  • IE3 high-efficiency motor
  • Insulation Class F, IP 55 protection
  • Three PTC thermistors as standard
  • Calibrated with OFC frequency controller for variable-speed systems
  • Easily accessible, central lubrication port for motors with regreasable bearings for fast and safe maintenance

Power transmission

  • High degree of efficiency
  • Automatic belt tensioning for consistently high power transmission ratio
  • V-belt guard
  • Belt tensioning device also serves as motor lifting device when changing the belt.


  • Oil line next to the enclosure door permits quick and easy changes of gear lubrication oil.
  • Easy access for all maintenance tasks through removable panels on the sound enclosure

Sound insulation

  • The system’s blower and motor cooling air is drawn in from outside the sound enclosure from the cooler ambient surroundings for maximum energy efficiency.
  • Effective sound-proofing provided by thick-walled lining with dense foam and damping louvres over intake and exhaust openings
  • Absorption silencer minimises process air pulsation downstream from the blower block.
  • Low residual pulsation and therefore minimal sound transfer to downstream piping.


Blower axial fan

  • Axial sound enclosure fan with separate motor for optimal cooling, particularly with variable-speed operation
  • Drive motor equipped with own cooling air intake for maximum efficiency
  • External process air intake

Perfectly matched accessories

Unloaded start

AFE unloaded start valve

The optional unloaded start valve (USV) is located under the sound enclosure.

Start control (STC)

Start control (STC)

Installed in the control cabinet: a star-delta starter (with remote operation capability), a sound enclosure fan control, an operating hours counter and KAESER CONTROL (the interface to Kaeser's service facility).

OFC-type frequency control

OFC-type frequency control

Frequency control enables infinite blower speed adjustment and, with the addition of a pressure sensor, also enables pressure regulation. The control unit coordinates operation of the frequency controller and the blower unit. Flexibility is further enhanced by the supplied signal output / input and Profibus connections.

Technical specifications

Standard version

ModelHB 1300 PI HB 1600 PI
Max. pressure differential – Gauge pressure mbar 1.000 800
Max. usable flow rate m³/min 125 156
Max. pressure differential – Underpressure mbar 500 450
Max intake volume m³/min 122,93 153,27
Max. rated motor power kW 250 250
Connection diameter DN 300 300
Dimensions without sound enclosure W x D x H mm 2.710 x 1.600 x 2.350 2.710 x 1.600 x 2.350
Max. mass without sound enclosure kg 3.465 3.625
Dimensions with sound enclosure W x D x H mm 3.205 x 2.150 x 2.610 3.205 x 2.150 x 2.610
Max. mass with sound enclosure kg 4.285 4.445