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Opakfil ES7 is a compact V-Bank filter produced by Camfil SAS (Saint-Martin-Longueau, France) with dimensions according to EN 15805, and filtration class of ePM1 60% according to ISO 16890. It consists of a an aerodynamic plastic frame and pleated glass fibre media, for the particle filtration of air and other gases. Compact filters, or rigid pocket filters are used in HVAC applications as final filters in industrial, commercial and residential applications, and also serves as prefilters in HEPA installations to improve indoor air quality and comfort. The compact filters in the supply air are used most commonly as a second filter stage, preceded by a prefiltration stage, either as complete filtration solution for these applications or as make-up air solutions for cleanroom process applications. Compact filters are characterized by high dust holding capacity and long lifetime which can be further extended by applying prefiltration stage.