A negative pressure dust extraction unit traps dust on the filter and returns cleaned air to the working space — in winter this also means less heat loss. The Felder RL 200 is a professional unit of this type: airflow up to 4000 m³/h, H3-class filtration and barely 0.1 mg residual dust per cubic metre of air.

The 4 kW motor at 2800 rpm creates a static pressure of 2350 Pa, and the Ø200 mm inlet connection can also accommodate more powerful machines. Thanks to clean return air, the unit can stand in the middle of the workshop.