Which limit values apply to air at the workplace?
Dust-free work should be facilitated for all workers at the workplace, in accordance with the Hazardous Substances Ordinance (GefStoffV).
The maximum occupational exposure limit (OEL) is a suitable guideline for this purpose. The lower the value, the more harmful the dust is at the workplace. Machines from dust class L are suitable for dust with occupational exposure limit values > 1 mg/m³. The suction device should have a maximum permeability of 1% and it should be possible to dispose of the associated filter bag with minimal dust.
Dust with occupational exposure limit values > 0.1 mg/m³ is listed in dust class M.
Accordingly, your extractor should have a permeability of 0.1% and it should be possible to dispose of it with minimal dust.
Meanwhile, dust class H refers to highly hazardous dust with occupational exposure limit values < 0.1 mg/m³.
Only dust extractors with a maximum permeability of 0.005% and completely dust-free disposal are suitable.
When carrying out tasks involving asbestos or harmful substances, you need to use dust extractors from dust class H, which also have a label for asbestos.
The maximum permeability and disposal of these machines correspond to class H.
The "Zone 22" class includes explosive dust. The maximum permeability and disposal correspond to dust classes L and M.
Legal requirements stipulate that M and H extractors must also warn users as soon as the airspeed in the hose is 20 m/s or slower.
For more detail, check out the video below:
The maximum occupational exposure limit (OEL) is a suitable guideline for this purpose. The lower the value, the more harmful the dust is at the workplace. Machines from dust class L are suitable for dust with occupational exposure limit values > 1 mg/m³. The suction device should have a maximum permeability of 1% and it should be possible to dispose of the associated filter bag with minimal dust.
Dust with occupational exposure limit values > 0.1 mg/m³ is listed in dust class M.
Accordingly, your extractor should have a permeability of 0.1% and it should be possible to dispose of it with minimal dust.
Meanwhile, dust class H refers to highly hazardous dust with occupational exposure limit values < 0.1 mg/m³.
Only dust extractors with a maximum permeability of 0.005% and completely dust-free disposal are suitable.
When carrying out tasks involving asbestos or harmful substances, you need to use dust extractors from dust class H, which also have a label for asbestos.
The maximum permeability and disposal of these machines correspond to class H.
The "Zone 22" class includes explosive dust. The maximum permeability and disposal correspond to dust classes L and M.
Legal requirements stipulate that M and H extractors must also warn users as soon as the airspeed in the hose is 20 m/s or slower.
For more detail, check out the video below: