Discover our solutions for cleanrooms and pharma

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High air purity is the essential requirement for sensitive controlled technical processes. Cleanrooms are used as they ensure a low-particle or, when necessary, a low-germ environment. The multi-stage Viledon filter concept can filter particles and harmful germs from the air in a reliable and energy-saving way.

The multi-stage Viledon air filtration system

The principle is simple and efficient: well-matched filter stages with Viledon air filters of various filter classes and designs. Usually a two-stage prefiltration consisting of Viledon pocket filters and cassette filters removes coarse to fine particles. Viledon EPA, HEPA and ULPA filters are used as a final filter stage. They are responsible for reliably arresting finest particles and germs and can be used in cleanrooms with turbulent or low-turbulent airflow.

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reinräume und Pharma mehrstufiges viledon Filterkonzept

Customized filter concepts for your application

Semiconductor manufacturing

Whether microprocessors or microcontrollers, solar cells, photodetectors or light diodes are concerned, every minuscule particle can impair the performance of technical products.


In nano research, orders of magnitude range from 100 nanometers to individual atoms. The tiniest foreign particles will have a negative effect on the processes and must be removed from the air.

Optics and laser technology

Optics and laser technology require maximum precision. Maximum air purity is, therefore, an essential requirement for the best results.

Pharmaceutical industry

In the manufacture of pharmaceuticals and active ingredients, it is crucial that germs and particles are reliably removed from the air to prevent contaminations and to ensure product purity.


A multitude of various applications fall under the term biotechnology. What they have in common is a high demand for purity. Enzymes, cells, and organisms can be used only when high purity is achieved.

Food and beverage industry

Strict hygiene regulations govern the production of food and beverage. This affects also the air filtration, which must function reliably at all times.

Services and Engineering

In addition to high-quality products, Viledon stands for excellent service, which guarantees you the maximum benefit of our air filters.

Viledon filterCair Service

Air quality management for cleanrooms

With the Viledon brand, Freudenberg Filtration Technologies offers an air filter program of filter classes G 2 to U 15, the highest demands in efficiency, and operational dependability. Completing this portfolio is our excellent service offer directly at the customer’s site.

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Engineering Screen Air Handling Unit

Viledon Engineering for cleanrooms

Complete air filter systems and comprehensive service from a single source

Freudenberg Filtration Technologies combines a comprehensive range of reliable and energyefficient filtration solutions with technical development and installation know-how for multi-stage filtration systems.

Viledon Engineering provides a complete service and installation program, including all construction elements for building new or modifying existing air filtration systems, especially in areas with stringent requirements on clean air quality.

Our Engineering teams are based all over the world and work closely with customers to provide efficient solutions no matter what size and scale the project has. Each Engineering solution is customized according to the requirements of each specific application. We use different construction types and a comprehensive range of components.

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How efficient is your filtration system?

Find the optimal filter solution for your plant with e.FFECT based on ISO 16890

Standardized systems for supply air filtration are frequently inefficient and do not make full use of their potential for optimization. The more specifically filter systems are customized to the respective ambient conditions and plant requirements, the greater performance and reliability they achieve.

Our experts work with you to develop the best filter solution for your plant on the basis of the testing standard ISO 16890. In the filter evaluation, typical urban and rural particle size distributions are considered based on the particulate matter fractions PM1, PM2,5 and PM10, and filter arrestance efficiencies are determined accordingly.

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With e.FFECT, the electronic Freudenberg Filter Efficiency Calculation Tool, calculating the optimal filter solution is extremely simple. The local ambient conditions and specific process requirements enter directly into the calculation. Multi-stage filter systems can then be objectively compared. This simplifies the selection of the best filter concept for your needs.

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ISO 16890 Particle size cleanroom and pharma Exemplary particle classification to PM fractions

Hygiene standards for maximum protection

Requirements for cleanrooms

Particularly strict regulations apply to cleanrooms. Airborne particles and germs must be reduced to an absolute minimum in order to protect highly sensitive products and processes.

Hygiene guidelines define clear specifications for ventilation and air-conditioning systems and units in sensitive application areas such as cleanrooms.

Classification of cleanrooms

EN ISO 14644-1

For the production rooms, the purity levels of the air vary depending on the product as stipulated in EN ISO 14644-1. This guideline classifies rooms according to their particle count per cubic meter (m³).
Test methods for EPA, HEPA and ULPA filters

EN 1822

In Europe, EPA, HEPA und ULPA filters are subject to classification according to EN 1822 for filtration efficiency and zero leakage. HEPA and ULPA filters are also subject to individual tests.
Viledon air filters satisfy the requirements

VDI 6022

VDI Guidelines 6022 “hygiene requirements for ventilation and air-conditioning systems and units” defines clear specifications for the use in sensitive application areas, such as clean rooms. Viledon pocket and HEPA filters satisfy all VDI 6022 criteria without restrictions.

In our download area, you will find detailed information about our technologies.

Reliable for sterile air and cleanrooms

Multi-stage Viledon air filtration systems

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Discover our products for cleanrooms and pharma.

Click on details for more information. Technical data and specific product features can be found in the e-catalog.

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Compact pocket filters

High-performance, economical and energy-efficient

Compact pocket filters

Robust in sustained use, high operational dependability and reliability even in the face of extreme moisture and wet conditions. They enable the energy-efficient operation of air conditioning systems. This translates to energy cost savings and a reduction in CO2 emissions.

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MaxiPleat cassette filters

High stability, dependability, economic efficiency

MaxiPleat cassette filters

The premium class in patented quality. Highly stable filter designs for the greatest possible operational dependability even under extreme loads. Water-repellent. Long service life, making them very economical.

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MVP cassette filters

Viledon quality for an optimal price-performance ratio

MVP cassette filters

Optimal price-performance ratio in the operation of ventilation systems plus simple and safe handling. MVP 95 filters achieve energy efficiency class A. Energy cost savings and reduced CO2 output.

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NanoPleat cassette filters

Extremely robust, water-repellent

NanoPleat cassette filters

Robust and extremely dependable in hygienic quality. With water-repelling hybrid synthetic nonwoven media (HSN) suitable for use in damp environments. Ideal for air-conditioning systems.

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Aluminum frame, PU seal

Extreme dependability, stability and moisture-resistance

Aluminum frame, PU seal

Satisfies the highest clean air and sterility requirements. Flow-optimized geometry and equidistant folds thanks to MiniPleat technology. Especially economical and reliable operation.

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Aluminum frame, Silgel seal

For the highest requirements in ultra-fine filtration

Aluminum frame, Silgel seal

For mounting systems with sword profile. The MiniPleat technology ensures a homogeneous media velocity for economical operation. Moisture-resistant and microbiologically inactive.

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Plastic plenum hood filter

Light and compact for flexible installation

Plastic plenum hood filter

Reliable operation thanks to high-arrestance micro-glass fiber papers and a flow-optimized geometry. The stable design is moisture-resistant and microbiologically inactive.

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