... 3) Low initial resistance 4) Flexible VITTOFILTER Pre filter,Air filter material,Air intake filter AF primary filter sponge, a filter sponse with ... mainly applicable to collecting the larger dust molecules in the air to prevent the medium filter from being filled and blocked ... : G3 DIN 24185Flame Resistance: F1 DIN 53438 VITTOFILTER spray booth,Air filter material,Air intake filter