The legislation consists of a part for the unit and a part for the filters used. The publication CROW 400, in combination with a CE mark, applies to the units. The filters must meet the statutory requirements of NEN 4444. In general terms, the overpressure must be between 100 and 300Pa with an airflow between 40 and 120 m/s.

For the dust filters EN 779, EN 1822-3 apply. The NEN-EN 14387 legally applies to the carbon filters. Replace your dust filter at least every six months, or sooner if they are saturated. You replace the carbon filter every quarter, or sooner if the ppm level is above the pre-set.