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Filter system testing

Filter system testing

Filter analysis & air hygiene

Almost all indoor spaces – from offices and public transportation to cultural and healthcare facilities – are now equipped with air conditioning, ventilation systems or air purification devices. These systems are intended to ensure a safe indoor climate and keep out particles, fine dust and viruses. Using various methods, OFI can test the efficiency of filters and other systems and thus also assist in the development of new products.

In order to permanently reduce biohazards in indoor areas, OFI experts have developed new test methods for testing biological particle loads. With the evaluation of filter systems in air conditioning systems, automotive ventilation systems or air purifiers, OFI contributes to a sustainable improvement in safety and quality of life.


Our Services

  • Filter (system) evaluation, if desired also with certificate
  • Determination of retention efficiency of filter media with bioaerosols including viruses and bacteria as well as airborne allergens (mould, pollen, proteins) and standardized test aerosols
  • Development and evaluation of realistic test setups (i.e. filtration efficacy testing directly in cars)
  • Efficacy testing of air purifiers and face masks with bioaerosols
  • Material testing regarding antimicrobial efficacy and microbial resistance according to ISO 846, ISO 20743, ISO 18184 and others
  • Material evaluation regarding biocompatibility (cytotoxicity, irritation and sensitization) according to ISO 10993 and OECD Guidelines
  • Risk assessment of products
  • Determination of efficacy of filter material for allergen elimination
  • Evaluation of alternative decontamination strategies such as UV-disinfection
  • Particle Release of Respirators

Real-Life Testing

As a rule, filter systems are usually tested with precisely defined mineral test dusts. However, it is difficult to draw direct conclusions about the reduction of allergens and germs from the separation efficiencies determined for certain particle sizes. At OFI we have the possibility to work with allergens, bacteria or viruses in addition to conventional test dusts. Using airborne biological particles and surfaces-based tests as well as the option of combining different mechanisms, OFI creates particularly realistic test conditions that can also be used to analyze alternative disinfection strategies.

Depending on the requirements, we develop individual test designs at OFI in order to characterize products extensively and under conditions that are as real as possible. For example, we can analyze the effectiveness of filter systems directly in vehicle cabins.


Certification confirms quality

To clearly demonstrate the quality of a product, certification can be requested from OFI CERT, the in-house certification body.

  • Certification according to ZG 210: Quality testing of automotive cabin air filters suitable for allergy sufferers.
  • Certification according to ZG 250: Air hygiene test of filters in passenger compartments of vehicles with regard to reducing the risk of transmission of infectious agents.

If a product meets the defined quality requirements, it not only receives a certificate, but is also entitled to carry the OFI Certification Label. This shows the product quality recognizable at a glance.


Comprehensive know-how through research & development

As a member of the research network ACR (Austrian Cooperative Research), OFI conducts applied research together with industry partners. As a result, SMEs can also benefit from current knowledge and use it directly for the implementation of new ideas and product developments.

Currently, the OFI is engaged in research on the following topics, among others:

  • Functionality of filter media for minimizing or inactivating particulate contaminants in the air
  • Further development of methods for determining filter efficiency
  • Efficiency of alternative decontamination strategies such as UV-disinfection of airborne germs

OFI Expert for Medical Devices & Hygiene

DI Gabriele Ettenberger-Bornberg, BA

OFI Expert for Filter Analysis

DI Bernadette Führer
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