The TZWL test center

At the Schwerte site (formerly Dortmund), we are one of three test centres recognized by the German Institute for Building Technology (DIBt) to test new domestic ventilation units on the ventilation technology, thermodynamics and tightness test benches. The test results form the basis for applying for a type approval from the German Institute for Building Technology (DIBt) in Berlin, a certificate from the Passive House Institute (PHI), Darmstadt, or serve to meet the requirements of European directives.

European test center for domestic ventilation units

We are a nationally and internationally recognized, accredited testing laboratory for ventilation units with and without heat recovery and moisture recovery. At our location in Schwerte, we test ventilation units as well as heat pumps, also combined with ventilation as a combination unit, air conditioning and split units, comparable systems and devices as well as components of ventilation units such as fans or heat exchangers.

Completed device tests
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Our range of tests and services

  • Development tests according to your wishes and specifications
  • Preparatory consultations on device developments or approval procedures
  • Measurements for authorities, offices and institutions
  • Participation in and organization of round robin tests
  • Tests for type approvals at the German Institute for Building Technology (DIBt), Berlin
  • Tests for certification by the Passive House Institute (PHI), Darmstadt
  • Tests in accordance with the EU requirements pursuant to Regulations (EU) No. 1253/2014 and No. 1254/2014 for energy labels
  • Tests according to international standards
  • Checks to register your devices in the funding databases of other European countries (e.g. Austria, Switzerland, Netherlands, Belgium)

  • Testing of components such as fans or heat exchangers

It goes without saying that we observe your wishes and the national, European and international requirements for all our own tests and tests via our cooperation offer.

Request a non-binding test

The test center at the Schwerte site

We examine all relevant key figures for domestic ventilation on our test benches

  • Test bench for determining the appliance tightness using the pressure method. The determination includes testing the tightness of the appliance housing, the internal appliance tightness and the flap tightness

  • Test stand for determining appliance leak tightness using the tracer gas method. Using tracer gas, we determine the appliance tightness for selected appliance systems using this measurement method

  • Ventilation technology test bench for determining the efficiency of the fans. The energy consumption of the fans and the volume flows of the devices are determined on this test stand.

  • Thermodynamic test stand for decentralized ventilation units. We use this test stand to measure the energy efficiency of devices with operating ranges of max. 100 m³/h, primarily decentralized devices.

  • Thermodynamic test stand for central ventilation units. We use this test stand to measure the energy efficiency of appliances with operating ranges of approx. 50 to 600 m³/h, primarily central appliances.

  • Flushing chamber test bench for changeover devices. With this test stand, we meet the requirements of the DIBt for testing changeover units. The volume flows of the appliances and their energy efficiency are determined here.

We test according to German and international guidelines

Standards and regulations according to which we carry out accredited or officially recognized measurements:
  • German Institute for Building Technology (DIBt), Berlin
  • DIN EN 13141-4
  • DIN EN 13141-6
  • DIN EN 13141-7
  • DIN EN 13141-8
  • DIN EN 13141-11
  • DIN 18017-3
  • EN 13141-7 STANDARD
  • EN 13141-8 STANDARD
  • NEN-EN 13141-7
  • NEN-EN 13141-8
  • EN 308
  • Regulation (EU) No. 1253
  • Regulation (EU) No. 1254
  • Passive house component testing on ventilation units <600 m³/h
  • Passive house component testing on single-room ventilation units
  • We carry out sound measurements as part of a cooperation
We can also carry out other measurements, e.g. on components or on air conditioning units and heat pumps.

A few technical facts about our facilities

  • Volume flows from approx. 5 to 600 m³/h
  • Temperatures from -20 to +30 °C
  • Relative humidity from 10 to 80
  • Electrical power consumption up to 7,200 W

In addition, as part of a cooperation with DMT GmbH & Co KG, a subsidiary of TÜV Nord, we also offer testing of ventilation units with large operating ranges between 600 and 100,000 m³/h.

We provide support with device development and test planning

Our range of services also includes technical advice and contributing our experience to your device development.

In addition to the testing requirements in Germany and the German market, we are also familiar with the testing requirements and markets of the EU and our European neighbors and can provide you with recommendations in this regard.

Ask us about our consulting services. You save yourself a lot of research work and have the opportunity to use our know-how, for example, to plan all the necessary technical requirements during device development.

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