Xiaomi Purely Respirator Mask Classic Edition Filter Set Respirator Mask Classic Edition Filter Set XiaomiPurely Buy Now Details Specifications FAQs Xiaomi Purely Respirator Mask Classic Edition Filter Set PM2.5 filtration efficiency is up to 99%. Filtration efficiency meets KN95 standard. Breathable and soft. Nano electret Filter PM2.5 filtration efficiency is up to 99% Composite Nanomaterial Breathable and Soft Purely mask includes 4 efficient filter layers, purify the air quickly and easily. Non-Woven Material Soft texture, skin-friendly gives you a safe and healthy breathing experience. Mask Filter Filtration efficiency meets KN95 standard. Ventilation Filter PM2.5 filtration efficiency up to 99%. Fresh air filter replacement method Use the filter cover removal tool to press the cover and turn it counterclockwise. The filter cover will naturally bounce. Remove the filter cover and the old fresh air filter. Insert the new fresh air filter completely into the corresponding position. After placing the filter cover in the proper position, use the filter cover removal tool to rotate the filter cover clockwise and rotate it to the end. Mask Filter Replacement Method Hold the end of the ventilation module and turn it clockwise to the head, remove the ventilation mudule. Separate from the middle seam to both sides and remove the outer clip. Remove the inner clip. Remove the mask filter.