version bag-in, bag-out, safe filter replacement with the use of bags Application Version bag-in, bag-out is intended for the filtration of air from the processes producing hazardous or even toxic substances. Short description Version bag-in, bag-out has installed connections for filter replacement with the use of bags. Installed filters are of H10 to H14 class. Advantages The system bag-in, bag-out prevents any contact with the contents of waste filter when replacing it. Combination of duct housing with absolute filter (AKF) with pre-filter (KPF) The installation of a pre-filter prolongs the life of an absolute filter. Pre filters are of EU 5 to EU 7 class.