The proven two-stage air cleaners of the Piclon range have been an established component of the MANN+HUMMEL range of air cleaners for many years. The air cleaners are particularly robust, have good filtration characteristics and are well suited for use in operating conditions with high dust and mechanical loads. Piclon air cleaners especially find application in quarries, cement plants or mining operations. In addition, the air cleaners are particularly suitable for applications which require a flame resistant housing. An axial tie-rod firmly welded to the housing and a securing nut keep the filter element securely in the sealed position.