Activated Carbon Dust Mask for Breathing Clean Air, with Extra Filters, Excellent for Cycling, Running, No more Exhaust Gas, Dustproof, and Pollution, PM2.5 N99, Outdoor Activities

描述

WHAT'S INCLUDED IN THE PACKAGE? ● 1x Neoprene mask with ear strips ● 2x Exhaust valves ● 3x Activated Carbon filters (N99, pm 2.5) HOW LONG FILTERS AND VALVES LAST? Duration time for filter depends on the breathing rate of the user and the pollution level. Filters can last for up to 6-7 times on average. We recommend to replace the filter once a week if the mask is used frequently. Valves should be replaced if damaged or clogged with dust or other particles.