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• HEPA™ Filter Cartridge for 446L Dust Extractor 1/PkRated at 99.995% - 99.999% Efficiency / 0.005% - 0.001% Max. Permeability Filters material >0.3 microns (μ) Each HEPATM Filter comes packaged with its own individual certificate of efficiency    Complies with Canadian Provincial Standards, US Military Standard 282, OSHA Standard 1910.134, EPA Standard RRP 40 CFR 745.83, DOE Standard DOE-STD-3020-97, International Standard IEC 60335-3-69, European Standard EN 60335-2-69Can be cleaned with soap and water (ensure filter has dried before re-installing on dust extractor)Do not use with wet materials