N99 Replacement Filters (4 Pack) for Healthy Air Mask PM2.5 face masks only

N99 Replacement Filters ONLY for Healthy Air Mask PM2.5 masks, NOT FOR Vogmask. The N99 Particulate Filters are NIOSH approved for protection against solid and liquid particles - not including those that contain oil. N99 replacement filters are NIOSH certified to have filter efficiency level of 95% or greater against non-oil based particulates. The N99 replacement filter can ONLY be used with any Healthy Air Mask PM2.5 face masks. Includes 4 N99 filters per/package. NO REFUNDS OR RETURNS.