What class of extractor do I need? L, M or H?

Firstly, you should determine which types of dust you are faced with at the workplace.

This will provide the basis for initially assessing the correct dust class. Festool offer extractors for L, M and H dust classes.
In many cases, a dust extractor from class M will suffice.

These products extract most of the dust that is produced at construction sites or workshops, including drywall dust, household dust, plaster, clay, ceramics, paint, lime, varnish, wood, concrete, cement and screed.

If harmful substances such as asbestos or mould have to be extracted, there are certain special extractors (CTH), which fall under class H and enable dust-free extraction.

For more information on working with dust and dust safety,
please see our Dust Safety page here and more information on different dust classes here.