General Description Two-layer Solid Glue Ceiling Filter with TC Fabric Weight 630G/M2 Thickness 22MM Air Flow Rate 900M3/H Initial Resistance 27pa Final Resistance 400pa Media Arrestance 98.2% Air Velocity 0.25m/s Dust Holding 470G/sqm Max Temperature 120 oC Filtration Class F5 (DIN 24185) Flame Resistance F1 (DIN 53438)