Airborne contaminants can be subdivided into various sizes (expressed in µm). Each range of this subdivision requires a specific filtration method. Thus, a subdivision into coarse dust filters, fine dust filters and absolute filters takes place. To avoid rapid saturation of the "main filter" - which is relatively expensive - the structure of the filters in a plant is tiered.
There are several air supply systems, each with its own specific advantages. The main air supply systems are:
- Open plenum systems
- Systems with separated ducts
- Systems with 'In-line housing'
- Fan Filtermodule system
- Satellite system