... holding Foldaway plank filter,cardboard frame air filter,pleat filter ,MERV air filter A) Large filter areaB) Low initial resistanceC) Large ... class: EU3, EU4, EU5 9 ) DIN53438 Non-flammability Standard: F1 10) Final resistance: (suggest)200Pa-250Pa11) Max. air flow: 125% of ... °C Foldaway plank filter,cardboard frame air filter,pleat filter ,MERV air filter