About 20 training workplaces for stonecutters are dedusted by a central filter. The total volume flow amounts to 360 m³/min and is cleaned by an pleated element filter INFA-LAMELLEN-JET, type AJL 3/1083, with 324 m² filter area.  

The dust discharge of the three chamber filter is carried out by a shared hopper with a screw conveyor and rotary valve. If later on lacquer and solvents should be used, the filter is designed pressure shock resistant (up to 0.4 bar g) and equipped with rupture discs.