Spatial filters


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Areas of application

Spatial filtration is used in central air conditioning systems of larger facilities (hotels, banks, sports facilities, business buildings, shopping centres, etc.). In residential buildings, forced ventilation with recuperation is increasingly widespread, whereby filter elements ensure the supply of clean air from the environment. In combination with the solid particle filter, a carbon filter is often used, which to some extent also removes unpleasant odours from the air itself. The effectiveness of such filtration depends on the size and shape of the filter housing.  Adequate spatial filtration also contributes to improved operation and longer life of machines and devices operating indoors (such as compressor stations, electrical installation equipment, machining centres, etc.).

Spatial filtration is also very important, whereby the air purity requirements are considerably higher, i.e. there is a high risk of infection, e.g. in hospitals, operating halls, laboratories, pharmaceutical plants, the food industry.

Filter materials

Case filters

Pocket filters

Compact filters

Absolute (hepa) filters

Filtration materials used for the purpose of spatial filtration are usually made of polyester materials and glass fibres. Filter materials made of polyester fibres or so-called ‘kofils’ carry out filtration in the range G2 to G4, and are intended for the filtration of inlet or outlet air of lacquering chambers. When they are cut into different formats, they are also used as filters of electric cabinets, aggregates and other machine tools. The ‘kofil’ is therefore suitable for the rough and preventive filtration and allows for higher flow rates.

Case filters are mainly designed for rough filtration class G2 to G4 and as end filters in simple ventilation systems or as protection for fine pocket or compact filters in ventilation systems. The case filter frame can be made of galvanized sheet, stainless steel, aluminium or cardboard. The filter membrane can be made of synthetic fibres – ‘kofils’ of different grades, polyester, polypropylene or cellulose.

Pocket filters are used for the fine filtration in ventilation systems of healthcare centres, shopping centres, public institutions and industrial plants. They also appear in more demanding ventilation systems of hospitals and high-tech manufacturing.

Compact filters are manufactured in the minipleat process and can handle large flows at low pressure drops. The following is characteristic for them:

  • high capacity of retaining fine dust, smoke, carbon black, pollen, bacteria, vapour
  • long life
  • large filtering surface due to pleated material

Absolute filtration is the event of air filter intercepting at least 85% of microparticles, which are marked by the MPPS (Most Penetrating Particle Size) abbreviation. Each air filter belonging to the category of absolute filtration should also have the EN1822:2019 quality certificate.

For a proper filter selection, at least the following parameters must be specified:

  • filter efficiency or filtration rate
  • pressure drop
  • airflow
  • application / purpose of filtration
  • size and shape of the filter
  • frame material

Our company offers all types of solutions in the field of spatial filtration:

  • Numerous filter materials in the form of filter plates or in bales (‘kofil’ materials of different types of synthetic fibres, filter material made of glass fibres)
  • Panel case prefilters
  • Pocket filters
  • Compact filters
  • Absolute – HEPA filters for clean rooms
  • Activated charcoal


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