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Hi-Flo XLS, XLT is a bag filter produced by Camfil Svenska AB (Trosa, Sweden) with dimensions according to EN 15805, and filtration classes according to ISO 16890. It consists of an aerodynamic plastic frame and glass fibre media, for the particle filtration of air and other gases. Bag filters, or 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 filters in the supply air are used in first and second filter stages, either as complete filtration solution for these applications or as prefilters for cleanroom process applications. The filters are also used in the exhaust air or in recirculation systems to protect the air handling units. Bag filters have a significantly higher dust holding capacity and longer lifetime than other filters. The service life of bag filters is dependent on the end user preferences. It may vary also for different types of installation and geographical location of the site, where the filter is installed. However, 1 year is an average lifetime of the filter, based on dust loading and related to its pressure drop increase, which results in high energy consumption. In addition, VDI 6022 recommends filter change after 1 year for the first filter stage for hygienic reasons.