Side Channel Blowers and Vacuum Pumps

G-Series - Regenerative blowers deliver vacuum and pressure performance

Some technologies are so good that it is hard to improve them. Elmo Riestchle regenerative blowers, also known as side-channel blowers, are such an example. They have proven their reliability in service for many decades, performing flawlessly day in and day out with virtually no down time. Our blowers can produce noise levels lower than that of most other vacuum pumps, centrifugal blowers and compressors.

The G-Series regenerative blowers feature NEMA Premium motors with voltage ranges for 50 and 60 Hz in protection class IP 55 (insulation class F) and are UL 507 and CSA 22.2 No.113 approved. This makes them the ideal solution for worldwide use.


  • High CFM capacities moderate pressure/vacuum
  • Ideal for point of use applications
  • Easy installation
  • Contact-less Operation
  • Tolerant to dust ingestion
  • VFD Compatible
  • Quiet operation
  • Up to 40,000 operating hours without maintenance (2BH2 model)

Product Overview: Regenerative Blowers

G-BH100 - The smallest regenerative blower on the market

With a height and width of approximately 4.9 inches and a depth of approximately 2.4 inches, the G-BH1 00 blowers are the smallest regenerative blowers available on the market.

G-BH1 - Classic with innovative technology

With their high inlet volume flow up to 1,413 cfm and a differential pressure of up to 313 in. H₂O, our low noise G-BH1 regenerative blowers have earned their reputation. They are reliable, low maintenance and durable. They deliver 20,000 operating hours between service and are virtually maintenance free.

G-BH2 VELOCIS - The regenerative revolution

Volume flow up to 520 cfm and differential pressure up to 420 in. H₂O. With its significantly expanded range of performance and lower noise levels, the regenerative technology can now be used in completely new fields of application that were previously inaccessible. They deliver 40,000 operating hours between service and are virtually maintenance free.

G-BH7 - Unsurpassed at highest differential pressure.

Our high performance G-BH7 regenerative blowers can create differential pressure of up to 435 in. H₂O. They deliver 20,000 operating hours between service and are virtually maintenance free.

G-2BH8 - Wider varieties of flow and CFM.

Our German developed 2BH8 series of regenerative blowers have capabilities upwards of 400 in. H₂O, with maximum flow capacities at just over 450 CFM. These tried and true blowers can operate up to 20,000 hours before needing serviced, operating virtually maintenance free.

Performance & Technical Specifications: Regenerative Blowers, Elmo Rietschle
G Series

Our regenerative blowers are available in a wide selection for performance ranges up to 1,766 cfm at 60 Hz and differential pressures of up to 420 in. H₂O. With flexibility and power, these blowers cover a variety of demanding applications, including high pressure and high flow applications.


Air Map G-Series Side Channel



  • Filling & Closing Machines
    • Vacuum filling is used for such products as beverages, cosmetics & pharmaceuticals
    • Air is removed simultaneously as the product is filled into the container
    • Removal of the air speeds up the filling process and extends the shelf life of the product
    • Air is removed from pharmaceuticals and cosmetics to ensure product purity
  • Labeling
    • Automated machines place adhesive labels to products and packaging
    • Vacuum is used in conjunction with suction cups to pick and place labels
  • Volume Reduction
    • Foam type products and clothing are reduced in volume by means of vacuum
    • Vacuum bagged items take up less space for transport and storage
  • Packaging Materials
    • Many common packaging materials are formed using vacuum
    • Examples include bubble wrap and inflatable bag packaging materials
  • Blister Packaging
    • Vacuum is often used to assist with the formation of consumer packaged goods

Medical & Dental

  • Medical Ventilation
    • Ventilators use a small blower component which provides air flow moving breathable air via a mechanical pumping operation into and out of the patient's lungs.
  • Hospital Air Beds
    • Air beds are used for bed-ridden patients at risk for bedsores. Inflating individual air chambers while deflating others varies the pressure on the skin, thus helping prevent bedsores.
    • Through selective raising and lowering of different areas, air beds can also help position the patient for treatment and personal care.
  • Dental Suction Systems
    • Vacuum is used in dental equipment to draw off liquids such as cooling water from the drilling machine, saliva and blood.


  • Conveying & Drying
    • Pellet Conveying
      • Pellets are conveyed through extensive pipe networks
      • Conveyed under vacuum (dense phase) or pressure (dilute phase)
  • Pellet Drying
    • Pellets absorb moisture which can affect the quality of the final products
    • Pellets are heated and dried to a specific moisture content
    • Regenerative blowers are used to circulate heated air through storage silos
    • Moisture is removed from the air by desiccant dryers
    • Blowers are used to regenerate (dry out) desiccant dryers
  • Extruding
    • Cooling & Drying
      • Hot plastic discharged from extruder is cooled with regenerative blowers
      • Blast cooling air ensures the ultimate quality and final product shape
  • Forming
    • Expanded Polystyrene (EPS)
      • Styrofoam products are formed from small beads of styrene in a form or mold
      • Steam is injected into the mold during the process
      • Vacuum is used to extract the steam and moisture from the mold


  • Vacuum Hold-Down
    • Vacuum is used as a holding force on CNC router tables
    • It provides an even uniform clamping force to prevent shifting of material
    • Wood, plastic and metal are held in place while routers cut out shapes
    • Mechanical clamping does not yield the same results as vacuum
  • Vacuum Dust Collection
    • Vacuum is used to suction off wood dust and shavings from work areas
    • Scrap is conveyed to central collection bins for disposal or recycling
    • In-line filters play an important role in protecting vacuum blower unit

How Regenerative Blowers Works: Operating Principle

The impellers in the G-Series machines are mounted directly on the motor shaft for contact free compression. Maximum reliability, even at high differential pressures and large volumes of air, is ensured by the arrangement of the bearings outside the compression chamber.

  1. Gas is taken in through the inlet and enters the side channel.
  2. The rotating impeller imparts velocity energy into the gas in the direction of rotation. Centrifugal forces in the impeller blades accelerate the air flow outward, and with this increase in centrifugal action there is also an increase in pressure. Kinetic energy is imparted with every rotation resulting in further pressure increase.
  3. The side channel narrows at the rotor, sweeping gas off the impeller blades and discharging it through the outlet silencer where it exits the blower.