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Contaminants come in different forms – generally: aerosols (dusts, mists, fibres, fumes, microorganisms) or gases or vapours. You can choose between the filter types to protect against one of these forms or a combination of both of them. The following table shows you the colour coding of filters according to EN 14387 – which helps you to determine which filter-type is needed for the contaminants you are dealing with Differentiation of filter types Filters are split in different classes according to their capacity (gas filters) or their efficiency (particle filters). The class of a particle filter indicates how efficient the filter is in filtering out particles: class 1: 80%, class 2: 94%, class 3: 99.95%

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