Turnkey cleanroom technology made to measure

Kretz+Wahl is a renowned plant engineering company that has been active in the field of HVAC and cleanroom technology for more than 40 years. As a general contractor, we offer the full process chain from consulting and design to turnkey cleanroom, measuring room and dryroom systems, including all services.

Our expertise extends to high-tech industrial sectors such as microelectronics, battery, laser and optics. We are also active in life science technologies such as pharmaceuticals and cytostatics, medical technology, food technology and vertical farming.

We attach great importance to understanding our customers‘ processes and developing customised solutions together. In doing so, we always keep in mind that we guarantee a standard-compliant implementation according to ISO 14644 and VDI 2023, a GMP-compliant execution and acceptance. For us, the energy-saving implementation of all relevant processes is the goal of every design and realisation.

You can rely on our experience in new construction, conversion and expansion. Our service competence and readiness completes our delivery and service portfolio. A wide range of cleanroom components and high-precision air-conditioning systems are an important part of our supply portfolio.

Our target industries

High Tech Industries

  • Optics / Optoelectronics / Photonics
  • Laser Technology
  • Microelectronics 
  • Sensor technology
  • Aerospace 
  •  Nanotechnology
  • Battery cell production
  • Photovoltaics / Solar cell production

Life Science Industries

  • Biotechnology
  • Pharmacy / Cytostatics Pharmacies
  • Phytopharmaceuticals
  • Medical Technology
  • Medical Packaging
  • Food industry
  • Farming
  • Vertical Farming

Kretz + Wahl Gebäudetechnik GmbH & Co. KG
Ruhberg 10-12
35463 Fernwald-Steinbach
Tel. +49 6404 8050


Dipl. Ing. Karl-Heinz Lotz
Head of BU Cleanroom Technology/ EVP

Company data
Foundation: 1979
Part of the KLE Group

Locations (Germany)
Fernwald, Gießen, Bad Vilbel, Gilching

Business Areas

  • Clean room, measuring room, dry room technology
  • Air conditioning, ventilation and refrigeration technology (HVAC)
  • Precision air conditioning units & Laminar flow systems
  • Consulting & Design
  • Maintenance & Service

Asklepios BioPharmaceutical, CSL Behring, Greenerity, Heraeus, Infraserv, Novartis Pharma, Pascoe, Pfeiffer, Vacuum, Pharmaserv, Sanofi-Aventis, SCHOTT AG, Sun Chemical

Deutsches Reinrauminstitut e. V. (DRRI e. V.), ITGA e. V / Industrieverband Technische Gebäudeausrüstung und Umwelttechnik Hessen e. V., Silicon Saxony  e. V., VIP3000 e. V.



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