7 Filter cartridges being parts of Filtering machines for compressed air and surface technology; air suction machines, filtering and separating machines for filtering and separating target materials from an air flow, namely, for separating dust, wood chips, and spray media, in particular paint, varnish or powder particles as well as excess spray media being oversprays, and other solid or liquid particles, in particular for the wood, paper and plastics processing industry and for paint shops and painting industry; mechanical systems and mechanical devices, namely, filtering and separating installations for collecting and recovering spray media, in particular paint, powder or excess spray media being overspray; dedusting installations, namely, dust removing installations for industrial purposes, in particular for cleaning purposes, for surface treatment and for paint shops and painting industry; dust extraction systems, namely, dust extracting installations for extracting dust from air in commercial work environments; grinding dust extraction systems, namely, dust removing installations for purpose of removing dust from material grinding operations; paint mist extraction systems, namely, paint mist extracting installations for removing paint mist from painting operations; power operated blowers for compressing, sucking in and transporting dust, wood chips, spray media, in particular paint, varnish or powder particles as well as excess spray media being overspray, and other solid or liquid particles for the wood, paper and plastics processing industry as well as for paint shops and painting industry.