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Absolute filters

What are they?

Absolute filters (EPA/HEPA/ULPA) are high-efficiency air filters used for disinfection of air. They are used in the final stage of filtration in ventilation systems. The main task of the filters is to stop fine dusts, microorganisms such as fungi, bacteria or protozoa which may be harmful to the human body.

Absolute filters are used in rooms with high requirements for air cleanliness such as operating theaters, buildings/halls of food, pharmaceutical and electronic industries.

Remark-Kayser offers the highest quality EPA, HEPA, ULPA filters that meet the requirements of the PN-EN 1822-1:2019 standard. Each absolute filter is tested in a specialized laboratory, where it receives a factory number and a quality certificate after positive verification. The range of tests carried out includes flow resistance measurement, leakage test and filtration efficiency.

The absolute filters we offer are manufactured using two types of technology: mini-pleat and aluminium separators.

Mini-pleat technology

Filtering medium is a high quality, non-hygroscopic fiberglass filtering carton forming a filtration package with the use of modern mini-pleat technology. Proper separation of the carton layers is ensured by glue streaks, which also allow for the exclusion of aluminium separators from the design. 

The packet is fixed in the casing with polyurethane glue, and the frame is provided with a flat gasket, as a standard from the air inlet side or according to the Customer’s wish. We offer frames made of galvanized steel, aluminum and MDF.

We also offer HEPA filters with increased filtration efficiency and V-shaped

Aluminum separators technology

Filter pack consists of a waterproof fiberglass filter carton separated by aluminum separators embedded in polyurethane resin at the edge and can be placed in either a galvanized steel frame or an aluminum housing. The frame of the filter is equipped with a flat gasket on the air inlet side (it is possible to use a gasket in a place specified by the Customer) and the whole package is sealed in the housing with a chemically cured resin. Such a construction of the filter, in addition to its high resistance to mechanical damage, also ensures the stability of the package in the event of an unforeseen increase in pressure on the installation and prevents it from falling out of the frame.

Filtration classes

Thanks to years of experience and expertise, our absolute filters are manufactured with due care corresponding to the responsible range of performance filters, contributing to the improvement of health protection in the most demanding applications.

In accordance with the requirements of EN 1822-1:2019, our absolute filters are individually certified with test results, confirming the filter class:

  • class E11: the certificate specifies the average values of filtration efficiency and flow resistance
  • class H13: the certificate specifies the average values of filtration efficiency, flow resistance and the result of a leakage test performed for each filter.
  • class H14: The certificate states for each filter the filtration efficiency, the flow resistance and the leakage test result.

Classification of EPA, HEPA and ULPA filters according to PN-EN 1822-1:2019:

ClassificationClassTotal efficiencyLocal efficiency
The minimum filtration efficiency for individual filter classes is determined for particles of 0.3 µm.


The original application of absolute filters was in the Manhattan Project (the US atomic bomb program), where HEPA filters were designed to clean the air of radioactive contaminants. Over time, the range of applications has expanded and today this type of filter is used in so-called clean rooms, where air filtration is for the safety of people, as well as products created in the production process, i.e. in facilities such as:

  • hospitals and health care facilities, 
  • nuclear power plants, 
  • industrial plants producing food, medicine and new technologies.

Our clients