Customer segments

HLU’s products, components, apparatus, systems and services have long been used in many industries.

Virtually every industry faces economic, social and environmental challenges. Industrial companies must invest massively in environmental technology in order to meet energy and climate policy goals. At the same time, rising energy costs are eating into margins. Between its four divisions, HLU offers perfect solutions to all tasks.

Medical and hygiene sector

We have worked in the field of hygienic air conditioning for over 30 years. Our experience and expertise qualify us as an effective partner. We work with you to develop a system concept that meets the requirements of modern and comfortable air conditioning as well as the demands of hygiene. Naturally, our work complies with current standards and guidelines in hospital construction. We take charge of renovation and reconstruction on your behalf and offer a fast and cost-optimised implementation of the building project. In addition, we oversee scheduling and technical coordination with the trades involved in the work. Our range of services includes providing ventilation and air conditioning for the hygiene-critical areas:

  • Operating theatres
  • Intensive care units
  • Stroke units
  • Sterilisation
  • Laboratories
  • Radiology
  • Pathology 
  • Pharmacies 
  • Examination and treatment rooms 
  • Patient wards 
  • Kitchens

Electroplating industry

The use of open acid tanks for surface treating metals places extremely high demands on the chemical resistance and mechanical strength of the tanks and exhaust air systems used.  To protect employees and the environment, the vapours from the tanks must be safely collected, cleaned and discharged. We support you in this task with optimally matched pipe and duct systems for conveying chemically contaminated exhaust air as well as individually adapted scrubbers and chemically resistant plastic fans. The energy used can be efficiently recovered from the exhaust air using plastic heat exchangers. This allows you to significantly reduce energy costs while helping to protect the environment.


In contrast to domestic composting, the composting process in intensive composting plants is largely controlled. The use of pressure aeration avoids the creation of anaerobic decay zones in the intensive composting process.   The odorous substances that arise during aerobic decomposition, in the form of organic acids among others, are broken down in downstream biofilters and washed out with scrubber systems. HLU products offer optimum resistance to chemical attacks of all kinds, so they can be used for a wide range of applications in the areas of household-waste, green-waste and sewage-sludge composting.

Science and research

Germany’s future lies in the development of new technologies and medical and pharmaceutical products. Science and research require spaces that offer optimal conditions for successful ideas and their implementation.  Our know-how in air-conditioning laboratories and research facilities can enable you to work and research under healthy environmental conditions. The decisive factors are correct ventilation and extraction, compliance with TLV values in the workplace and the necessary safety of the technology. The quality of our services is particularly well established and reliable in the field of laboratory animal housing ventilation and control. With our experience for these kinds of projects, we have developed exceptional expertise in this system technology, which we can use to successfully support your project. The requirements for air conditioning and hygiene in such areas are changing rapidly, and, as an experienced partner, we are happy to help you with our engineering services.  Our range of services includes ventilation and air conditioning solutions for:

  • Laboratory ventilation with safety ratings S1 to S3
  • Laboratory animal housing ventilation
  • Exhaust air systems for fume hoods
  • Safety cabinet ventilation

Water treatment

Clean water is a basic requirement for healthy living. The wastewater collected in sewage treatment plants is a cocktail of aggressive substances in fluctuating concentrations. Here HLU can support you with the right materials and products. The use of plastics guarantees protection against corrosion by organic and inorganic substances and enables air- and watertight installation.


As an energy source from renewable raw materials, biogas is gaining greater and greater economic importance. In the absence of oxygen, microorganisms convert carbohydrates, proteins and fats into the main products methane (CH4) and carbon dioxide (CO2).  The organic raw materials are broken down by microorganisms into water, organic acids, carbon dioxide (CO2) and hydrogen (H2).  In addition, nitrogen (N2), hydrogen sulphide (H2S) and ammonia (NH3) are usually also present. Our products offer the optimum combination of chemical resistance, even with changing material compositions, and the necessary explosion protection for ATEX zones 2 and 1.

Laboratory equipment

Many of the chemicals used in laboratories release harmful vapours during storage and handling.  These vapours need to be effectively extracted with a system that runs continuously, 24 hours a day.  Table and fume hoods, for instance, contain exhaust air cleaning systems and fans. These are specially designed for high chemical loads, such as occur during the evaporation of inorganic acids such as sulphuric and hydrochloric acid or aqua regia, and offer you a high level of safety and a long service life.  The demand-based control of the fume-hood exhaust air is effected by volumetric flow rate regulators. Additional protection requirements arise when handling explosive media. Here too, HLU offers bespoke solutions for your specific needs.

Food industry

When producing food, you must comply with strict hygiene regulations. Acid and alkaline solutions are used to clean containers that come into contact with food. When these combine with increased temperatures and humidity in the exhaust air, highly corrosive mixtures can form. To ensure that your exhaust air handling takes these conditions fully into account and to guarantee the safety of your employees and plants, we are happy to help you with corrosion-resistant exhaust air solutions. For crate cleaning, in butcher’s shops for example, or bottle cleaning in the beverage industry, we offer not only standard products but also tailor-made fans and moulded parts for all kinds of applications. Our range also includes customised products made of food-safe plastics (natural polypropylene).

Chemical and pharmaceutical industry

Exhaust air is generated in many chemical industry plants, some of it with very high concentrations of contaminants. HLU can help you design your plants to meet these special requirements. Thanks to their protective devices and electrical function monitoring, our products offer groundbreaking levels of operational safety.  HLU’s solutions are in use in many of the largest chemical companies, where they have proven their reliability over time. We would be happy to draw on our many years of industry experience to help you, too.

Semiconductor industry

The industrial production of integrated circuits such as microprocessors involves the use of various chemicals and etching techniques. Media such as hydrofluoric acid (HF) place extremely high demands on chemical resistance. HLU supports you with highly corrosion-resistant plastic solutions to safely convey the exhaust air generated during the manufacturing process and to clean it of aggressive substances. Based on your individual requirements, we also develop large fans to provide the best possible service for your processes. With our expertise, we are at your side from the design stage to the installation site.