Main page » Technologies » Synthetics injection moulding » Development of optimized blower systems

GRONBACH develops complete blower systems such as ventilators and impellers with housing, motor and electronics according to customer specifications. In contrast to ready-made modules, we develop and produce individual and, above all, optimised tailor-made solutions – from requirements management to planning and design, toolmaking, simulation and series production.

Since 1970, more than 100 million fan wheels have left our factories. They are used in numerous industries such as automotive, rail, air conditioning, refrigeration, medicine, IoT and environmental technology.

Manufacturer of plastic injection moulding fan wheel, impellers and company optimization impeller

Your benefits

  • Development of optimized systems (impeller + motor + electronics + housing + air ducting)
  • Optimization and development of air blower
  • Improved efficiency through adapted fan wheel geometry and air ducting
  • Improved flow behavior
  • Noise optimization
  • Cost optimization through optimized sizes
  • Motor procurement and adaptation, depending on requirements
  • Flexibly adapted electronics for different motor types, integrated or separated
  • Possibility of integrating optimized solutions into existing systems
  • Casing design and production
  • Electrical testing

CASE STUDY: Successful replacement of a metal fan wheel with plastic. This has led to a significant reduction in costs and an increase in efficiency for the customer.

Producer, supplier and manufacturer of turbines, blowers and ventilators made of plastic


  • Requirements analysis fan wheel, motor and electronics
  • Analysis of fan wheel geometry and redesign
  • Analysis of motor and electronics requirements
  • CAD design and simulation
  • Prototyping (impeller, housing, hubs, electronics)
  • Tool design and construction

Steps in development

Definition of needs and objectives
Acquisition of the actual state (for already existing impellers)
Fan impeller and casing design
Simulations: FEM, CFD (Numeric)
Simulation analysis and optimization
Tests under real conditions
Analysis of the testing and optimization/production geometry

Laboratory and test bench

  • Flow test bench according to DIN EN ISO 5801
  • Engine test bench (speed, torque)
  • Noise measuring chamber
  • Spiral housing test bench
  • Burst test
Producer, supplier and manufacturer of turbines, blowers and ventilators made of plastic

Manufacturer of ventilation wheels and fan wheels as injection moulded parts as well as ventilation systems

Production of fan wheels and impellers

  • Fan impellers of the most varied designs, e.g. axial, radial, diagonal and drum rotors
  • Modern plastic injection moulding machines
  • Plastic injection moulding with different materials, with and without glass fibre reinforcement
  • Single- and double-fluxed rotors
  • Forward or backward curved, welded
  • High concentricity
  • Hubs (sintered, aluminium, stainless steel, die-cast zinc)

Details fan wheels & impellers at a glance

Competences in manufacturing

  • Closing forces of 50-300 t
  • Automatic hub feed
  • Quick removal of finished ventilation wheels
  • Ultrasonic welding systems
  • Drying system
  • Own mould construction with multi-cavity moulds
  • Series runout, axial runout and unbalance
  • Assembly of components

Further informations

You can find additional information on our plastic injection moulding processes, the manufacture of fan wheels and turbines and our corporate network in our brochures, which you can order free of charge. In addition, our competent staff will be happy to answer any further questions you may have.

Fan wheel Bavaria
Download fan wheels brochure
company optimization impeller
Download company brochure


Gronbach Wasserburg - Manufacturer of fan wheels and turbines


Gronbach Wasserburg - Manufacturer of fan wheels and turbines and ventilators

The location technologies in the field of ventilation wheels and turbines

  • Mechanical treatments
  • Anodising and powder coating
  • Labelling