MOLDEX REPLACEMENT PREFILTER 8010 replacement cartridge. Certified under NIOSH 42 CFR 84 to have a filter efficiency level of 95% or greater against non-oil based particulate aerosols. Use as a prefilter with #8020 Retainer and Chemical Cartridges, or as a standalone filter with #8900 Filter Holder. Approval #TC-23C-1338