Filter cells execution 2 are proven standard filter of conventional ventilation and air conditioning as well as painting. A simple filter change is ensured by the handling and easy disposal of residual waste. The filter of version 2 with metal frame are characterized by high quality and a large filtration area. In the fine folds are held by spacer beads in the form. Especially for demanding applications such as laboratory ventilation, chip production or food production or medical devices, this version is suitable.