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FRS-40 Coarse filter cotton ·Washable and reusable ·Low initial resistance ·Large dust holding capacity ·Flexible ·Economical and practical Application: ≥5μm, Filter dust, (used in the places where need washing and filtering), pre-filter through air filter program Type: supply pads or rolls size Media: synthetic fiber with gradual density Washable: about 7-8 times EN779 class: G4 Average arrestance:91%(ASHRAE52.1-1992) EUROVENT4/5 class: EU4 DIN53438 Non-flammability Standard: F1 Final resistance: (suggested) 200Pa-250Pa Max. Dust holding capacity: 620g/m2 Temp. resistance: 100°C TypeDimensionRated air velocity(m/s)Initial pressure drop (Pa) Rated air flow(m2/h)Length(m)Width(m)Thickness(mm)Rolls201/220 ± 21.0383600