Price concessions, authoritative certification, used for respiratory protection of certain particulate matter, such as dust generated by grinding, cleaning and processing of minerals, flour and certain other materials, also suitable for liquid or non-oily generated by spraying Particulate matter that does not produce harmful volatile gases. Can effectively filter and purify the inhaled abnormal odors (except toxic gases). May help reduce the exposure level of certain respirable microbial particulate matter (such as mold, anthrax, tuberculosis, etc.),
