For use with BHS protective face covering (sold separately here). Non-woven, active carbon cloth filter that conforms to standards GB2626-2006. Spunbond cloth filters micron-level dust (PM2.5 - particulate matter 2.5 microns) reducing dust, particulates and allergens such as haze, dust, pollen and motor vehicle exhaust emissions. Recommended to replace filter every 1 to 3 days, depending on use.

Disclaimer: This filter is designed to aid defence against the spread of infection. It makes no assurances that it can prevent transmission or infection of disease or viruses. It is not a medical or clinical mask and should not be used under any circumstances where infection level is high or it could be exposed to high level heat sources or combustible substances.