Mechanical filters

Mechanical filters are the most versatile of all filter types. They cover almost the entire air-filter range. Their applications extend from 200 metres under the ocean (in supply-air filters for submarines) to high-altitude mountainous regions (in kitchen-exhaust filtration in mountain stations) – and include the filtration of insects, liquid aerosols, and suspended radioactive dust. The following will provide you with a small selection of the many possible applications of mechanical filters.

Emulsion-mist filtration:
Emulsion mist (water-soluble cooling lubricants) can occur, for example in the processing of CNC. For this application, mechanical filters have a major advantage over electrostatic filters: operational reliability. The operating costs for mechanical filters are also lower than those for electrostatic filters. This is a result of the fact that electrostatic filters – owing to the electrical conductivity of water-soluble cooling lubricants – require intensive cleaning, in order to prevent the spark-overs that otherwise very quickly occur. Selection of the optimal mechanical filter will depend on whether central or decentral exhaust is required. The selection of filter media will depend on whether the user implements recirculated-air or exhaust-air operation.

Air-duct filters, central-installation systems, or compact decentral exhaust units

Filtration of dust:
One of the major fields of application for mechanical filters is dust separation. In such applications, aerosols are trapped and retained. The cost-effectiveness limit here will vary, depending on the type of dust, between < 2 mg/m3 and < 5 mg/m3. The spectrum of dust particles to be filtered ranges from those found in normal room air, to process air, and to applications with radioactive isotopes. Dust collection predominantly makes use of disposable media.

Air-duct filters, central-installation systems, or compact decentral exhaust units

Safety filters:
If dust-collection filters are used to remove toxic dust, mechanical filters are frequently applied as safety filters, especially in recirculated-air applications.