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Vortex® Regenerative Blowers


Spencer-Made Vortex® Regenerative Blowers

Vortex® regenerative (side channel) blowers are manufactured in the United States by Spencer using U.S-made components. They are produced in Spencer’s 200,000 sq. ft. headquarters in Windsor, Connecticut and stocked here, ready for immediate shipment. Spencer has direct sales offices, manufacturers’ representatives and stocking distributors across North America. They are supplemented by independent representatives in many countries internationally.

Click here to obtain additional information and selection assistance.

In-depth technical support is available regarding blower sizing, selection and application; multi-blower purchases for OEM equipment; and blower customizing for special needs.

Product Characteristics

Compact, lightweight design

  • Single stage blower with C-faced motor in a small  package
  • Aluminum castings reduce weight

Excellent performance range

  • Volumes to 645 SCFM
  • Vacuum ratings to 104″ H20
  • Pressures to 108″ H20


Long-life reliability

  • Cast aluminum impeller and housing for high strength
  • Simple construction with only five major components–base, housing, impeller, bearings, motor
  • Sealed bearings prevent contamination failure
  • Single annular compression cell prevents heat stress failure
  • Double lip elastomeric shaft seal minimizes leaks
  • Fully retained impeller prevents vane fracture and blower failure
  • Single seal gap reduces tolerance requirement and blower failures during high temperature operation

Oil-free air delivery

  • No hydrocarbon entrainment
  • Suitable for healthcare and scientific applications

Less heat and noise

  • Single-sided impeller with single vortex generates less heat and noise than “paddle wheel” designs
  • Unique annular chamber with smooth laminar airflow lessens noise
  • Aluminum housing offers excellent heat dispersion
  • Built-in silencer

Application flexibility

  • Constant velocity blower has no pulsation or surging
  • All blowers can be run in reverse without loss of performance
  • All TEFC models can operate on 50 Hz without modification

Operating Principle


Vortex® blowers generate high-pressure airflow during each rotation of a unique one-sided, single-stage impeller. The impeller has 30 to 50 vanes that create discrete air pockets. Air entering these pockets is accelerated in two directions, axially and outward (radially). Air entering the outer housing’s annular chamber is redirected into successive pockets of the spinning impeller. This airflow cycle forms a vortex or stretched spring pattern (see diagram). Velocity energy is increased or regenerated many times as air moves  between the blower inlet and discharge.




Competitive designs have a double-sided or “paddle wheel” impeller. This design, with its twin vortices, is characterized by higher noise levels as the vortices are created at the inlet and merged at the discharge. These blowers have two seal gaps between the housing and impeller, complicating tolerances during operation at high ambient temperatures.

Versatile Standard Vortex Features

To adapt Spencer Vortex® blowers for specific applications, often all you need is the flexibility built into the standard product line. For example, Spencer has invented and patented a unique inlet/discharge flange (U.S. Patent 5,791,870) that is standard equipment on small blowers. This flange can be simply reversed to make either tube stub connections or threaded connections as desired.

All Vortex Models Offer:


  • Pressure or vacuum use
  • Rotation in either direction without loss of performance (not possible with “paddle wheel” designs)

In addition, these specifications are selectable within the standard product line:

  • Single or three phase power
  • 50 Hz or 60 Hz operation (all TEFC models)
  • TEFC or explosion-proof motor
  • Variety of voltages
  • Airflow to 645 SCFM, vacuum to 104″ H20, pressure to 108″ H20 (photos of custom blowers)

Customizing Alternatives


These are some of the easily arranged product changes which can adapt these machines for special needs:

  • Special voltages
  • Special motor configurations (e.g., severe duty or premium efficiency)
  • Custom paint color
  • Special coatings
  • Special labeling


Here are more custom possibilities for your shipping convenience
  • Flexible release schedules
  • Just-in-time shipments
  • Special blower packaging or palletizing

Uncertain whether we can meet your need? Click here to arrange specialized assistance from Spencer

Sample Applications

There are many types of pressure and vacuum applications for Vortex® blowers. Their compact size, low noise and reliable operation are particularly well-suited for OEM applications within printing, food and chemical processing, textile, metalworking, waste treatment, environmental protection, aquaculture, business machine and medical equipment. These are some typical uses involving holding, carrying, evacuating, transferring, aerating and ventilating:

  • Air beds and tables
  • Refuse burning
  • Automatic loading
  • Product drying
  • Air cushioning
  • Liquid agitation
  • Sewage aeration
  • Pellet conveying
  • Blister packaging
  • Liquid spraying
  • Fuel atomization
  • Air knives
  • Stack sampling
  • Fluidized beds
  • Respiratory systems
  • Radon gas elimination
  • Automatic bottling
  • Pneumatic conveying
  • Vacuum hold-down
  • Soil remediation
  • Paper transporting
  • Scrap collection
  • Powder recovery
  • Gas sampling
  • Thread holding
  • Dust collection
  • Trim removal
  • Small vacuum systems
  • Parts handling
  • Material pickup

Vortex® Blower Selection

There are a number of issues to consider for blower selection, such as the type of application, electrical input (volts, phase, Hz), airflow requirement, pressure or vacuum requirement, inlet pressure, etc. These can be discussed with a knowledgeable Spencer Representative. Page 7 of the catalog, titled Selection Tips, reviews these selection factors, organized in a straightforward question/answer format.

Vortex® Blower Accessories

These accessory items are designed and sized for compatible use with Vortex regenerative blowers. In particular, inlet filters and relief valves are recommended by Spencer to protect your blower from abrasive dust and overheating.

Relief Valves


Spencer relief valves protect Vortex® blowers from overheating in a blocked-off mode during vacuum or pressure operation.

Inlet Filters


Inlet filters are typically used in pressure applications to prevent dust, abrasive particles and contaminants from entering the blower. Filtration efficiency is >99% per SAE Fine Dust Test (10 micron particles).

Inline Filters


Inline filters have two connections and are typically used in vacuum applications to keep dust and abrasive particles from entering the blower through the connected piping. Filtration efficiency is >99% per SAE Fine Dust Test (10 micron particles).

Inlet Filter/Silencers


Filter/silencers combine filtration and sound absorption in one compact assembly. They have a single connection and are typically used in pressure applications. Filtration efficiency is >99% per SAE Fine Dust Test (10 micron particles).

Tubular Silencers are open-ended for connection at either or both ends. In pressure applications, they are typically used between the blower inlet and an inlet filter. In vacuum applications, they are attached to the blower discharge.

Pressure and Vacuum Gauges


These gauges monitor line pressure in either pressure or vacuum applications. The range is 0–200″ H2O, pressure or vacuum. The dial is 2-1/2″ diameter, brass fitting is 1/4″ NPT. Pressure Gauge Part No. GAG90026; Vacuum Gauge Part No. GAG90032

Tubing and Fittings


Spencer can supply a complete array of components to create a pressure or vacuum tubing network or a custom manifold for a Vortex installation.

Control Panels


Complete electrical control packages can be provided for your Vortex® machine from simple starters to automatic start-stop controls.