Case Study: Energy Efficient Ventilation of Sports Halls


European manufacturer of climate control solutions


  • Delivery of complete fan units for sports halls (project business)
  • Increase in energy efficiency
  • fixed available space
  • Fixed project schedule (3 months start to finish)
  • No price increase


  • Design of customer-specific ventilation system
  • Switch from forward to backward curved wheels
  • Delivery of fan wheel, inlet cone, laser-welded, powder-coated housing


  • 26% efficiency increase
  • – 3 dB sound pressure
  • 26% less power consumption
  • Newly designed ventilation system consisting of two fan units
  • Delivery of 200 pcs. within 3 months

Project Overview

This European developer and manufacturer of technologically superior heating, hot water and climate control solutions, approached punker with the task of developing and delivering a new and optimized fan unit for an existing hall ventilation system within a timeframe of only three month. The punker solution included a switch from forward- to backward-curved fan wheels, a customized, laser-welded housing and supplying complete fan units that deliver a significant increase in energy efficiency and a substantial decrease in sound pressure.


    Our customer is one of the leading international companies for heating and indoor climate solutions. With its broad product range, they cover pellet boilers, heat pumps and solar systems and offer a comprehensive range of gas and oil condensing boilers as well as solutions for controlled domestic ventilation, in the field of indoor climate systems and heat recovery. The group of companies has 2,000 employees worldwide.


    The client approached punker with this time-sensitive project in July 2018.

    For an existing hall ventilation system, a ventilation solution with a new operating point was sought, which was to be delivered in a quantity of 200 units within a fixed time window of only 3 months. In the existing system, two blowers with forward-curved fan wheels of the punker Fclassic series and housings manufactured by the customer were used. What was needed was a wheel solution with motor asynchronous speed for the required air performance while at the same time increasing energy efficiency. The general conditions also included the limited space available due to the existing plant design and the requirement that the manufacturing costs of the plant should not be negatively affected.


    The aerodynamical project requirements and the available constructive installation space were discussed together with the punker application engineers and a solution was developed on the basis of the large characteristic curve data base of the punker company. The required operating point could not be reached with the forward curved fan wheels used up to that point. punker’s application engineers developed an alternative solution based on backward curved wheels of the R63B2 series, taking into account the available installation space and the given motor asynchronous speeds, including a housing. The use of laser welding technology allows punker to provide the customer with complete blower units quickly and at no additional cost to the customer. The final analysis of the newly developed blower units on the chamber test stand in punker’s laboratory showed an increase in system efficiency of 26%, and a reduction in noise emission of 3 dB.

      punker R63B2

      R63B2 – welded fan wheel for use in roof fans (300°C/2h, 400°C2/h, F400, F300, etc.), recessed fans, grain drying, industrial applications, generator cooling. Use as free running wheel or in housing.

      punker WEB | Fan Wheel Selection

      puncat WEB lets you select fan wheels directly from our website. Display fan wheels that meet your application requirements by entering the desired duty point , speed and wheel diameter range. You can specify your search by choosing industry suitability, fan wheel type and fan wheel series.

      Select the optimal fan wheel here.

      Your project with punker

      Are you also planning an innovative product that will revolutionize the market? Rely on the support of punker’s R&D team. Our engineers will work with you to find the perfect air technology solution for your project.

      Do you already have a detailed overview of your new product and can you provide information on air performance, drive and design specifications? Then simply send us this information with the technical questionnaire below and our team will immediately define suitable solutions for you from the broad punker portfolio.

      Or are you looking for a sparring partner who will work with you to develop ideas for a new or optimized series generation and accompany you through to series production? Then simply contact our application experts by e-mail at

      Technical Questionnaire




        Your eMail address*:




        Attention: Frequently all operating details are either not known or only inaccurately known. You must therefore as a manufacturer make sure by suitable tests that the correct fan wheel has been selected. When the following questions are answered as comprehensive as possible, we can submit a proposal as quickly and as defi nite as possible. Please give us further details on a supplementary sheet. This questionnaire on no account replaces a technical specifi cation (TSP).

        1. General Information

        1.1. Fan application (type of unit and appliance, rail application, compressor, etc.)

        1.2. Are there any special requirements on safety conditions? (e.g. explosion protection, danger of accident at wheel failure, etc.)


        Please state special requirements:

        1.3. Medium to be handled and its state (e.g. smoke gas with t max = 300° C, dust laden air or similar)??

        2. Air Duty

        2.1. Volume flow
        V' = m³/hcfm

        2.2. Static pressure increase
        Δpfa = PainWG

        2.3. single flow/double flow?

        2.4. Density of the medium
        rho = kg/m³lb/ft³

        2.5. Max. media temperature
        t = °C°F

        2.6. Max. A-rated sound power level
        Lw = dB(A)

        2.7. Other technical details (e.g. max. flow speed, special curve steepness, etc.)?

        3. Drive

        3.1 Is the speed variable?


        minimum ; maximum rpm
        fixed speed rpm

        3.2. Direct motor drive

        n = rpm

        3.3. Is a maximum motor power specified?


        maximum motor power Pw = kWhp

        3.4 Operating mode?

        S1 - IEC 60034-1other operating mode

        other operating mode =

        4. Dimensions and Constructional Execution of the Fan Wheel

        4.1. Can a standard fan housing be used?


        max. dimensions of spiral housing:

        4.2. Are certain main wheel dimensions defined?

        main wheel dimensions:

        4.3. Hub bore
        Ø d = mm, fit
        with/without keyway?


        4.4. Hub model and arrangement (e.g. inside the wheel, outside, etc.)

        4.5. Material of wheel body


        other material:

        4.6. Additional surface protection


        other surface protection:

        4.7. Additional specifications

        5. Demand, Pricing

        5.1 You would like to request an offer for:

        Sample wheels: pcs.

        (later) batch: pcs/year

        Lot size pcs/order

        5.2 planned start of production TT/MM/JJJJ