KN95 filter masks are designed for small viral particles such as COVID-19; They are effective to help protect against viruses, airborne dust, allergens, smoke, pollution, ash, pollen as well as the spread of oral liquids to mouth and nose.
PROTECTIVE MASKS WILL ONLY HELP PREVENT AND NOT GUARANTEE PROTECTION FROM CONTAMINANTS. CAUTION AND COMMON SENSE MUST ALWAYS BE USED.
Made in China
You can use the KN95 mask for many hours uninterrupted and for a number of days as long as your mask retains it's structural integrity. These respirators can perform optimally for eight hours of intermittent or even nonstop use. Regular replacement is necessary if the mask is damaged.