Dürr is a mechanical and plant engineering group that holds leading positions in the world market in its areas of operation. The Dürr Group operates in the market with five divisions.

ClustAir BW is a synergy alliance of highly qualified and innovative providers of exhaust air purification solutions "made in Baden-Württemberg".

Approximately 1500 employees make Fichtner the leading independent planning and consulting company for infrastructure projects in Germany. Fichtner’s main customer group consists of public and private infrastructural service providers involved primarily in supply and disposal activities.