What are L, M and H devices?

The employers' liability insurance associations and the statutory accident insurer use their own classification systems for dust removal machines (vacuum cleaners/dust collectors) that are usually used at mobile application sites (e.g. in the construction industry).

Dust removal machines of dust class L may only be used for slightly hazardous dusts, for example gypsum, sugar or grain dusts and for work thresholds of 1 mg/m³.

The dust class M is used for moderately hazardous dusts, for example wood, paint, plastic, metal, fibre, soot, quartz, mineral dusts and for work thresholds of ≥ 0.1mg/m³.

Dust class H applies to dusts that are assumed to be highly hazardous, for example chrome/nickel/cobalt, asbestos fibre (with special examination), glass fibre, bio-materials (mould), flour dusts and for work thresholds of 0.1mg/m³.

Checks involve the use of polydisperse chalk dust with a grain size distribution of 10% of 1 µm, 22% of 2 µm, 75% of 5 µm (analogue to DIN EN 60335-2-69:2015-07, AA.22201.3). [DGUV 309-012]

aeropur filters are not tested to this norm, but can be directly compared with the norms ISO 16890 and EN 1822 that we use as a minimum requirement. Our specialist on site will be happy to advise you.