WHY SHOULD WE NEED THE REFOSIAN DUST MASK? Our environment is full of dust, haze, vehicle exhaust, air pollution, the dust mask can keep you from 95% dust, dirt, pollen, allergens, fumes or particulates that effect your breath in the air.r> FUNCTION: HEALTHY BREATHING-Active carbon filters isolate 95% of dust, chemicals, fumes and particulates. SMOOTH BREATHING-Unique ventilation design, excellent permeability, double air breathing valve, air resistance is smaller, smooth breathing. FEATURE: Adjustable magic paste closure, one size fits most adults(unisex) Lightweight material: Diving suit lining Charcoal Filter (Total 5 layers) Filters object: vehicle and industry exhaust, dust,pollen, floating dust, virus, germ, PM2.5, H7N9 etc. HOW TO USE: 1.Put the gas mask between the nose and chin. 2.The back of the mask can be fixed with a Velcro. 3.Check if it is appropriate: cover your face with your hands, then breath hard and feel if there is air flow. 4.Make sure you are comfortable after wearing this mask by adjusting the back of the Velcro. REPLACEMENT: 1.Open the mask, revealing the internal valve filter. 2.Follow the OPEN instructions on the valve, counterclockwise rotation of the valve,separation the air valve. 3.Take down two valves, remove the filter. 4.Change a new filter, follow the CLOSE instructions on the valve, clockwise rotating the valve and replacement is completed. SPECIAL CARE: If you wear it 1-3 hours a day, it is recommended to replace the filter once a month, If you use it for less than 1 hour a day, it is recommended to replace the filter every 45 days.??
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