http://www.shu-lan.com/protective-products/mask/ 1. Product Introduction In layman's terms, the "safety valve" actually plays a role of "giving only, not feeding". If the outside air wants to enter the inside of the mask, it still needs to be filtered through layers; the gas exhaled by people can be smoothly discharged in the first time. Therefore, in the current epidemic, if you are an ordinary uninfected person, wearing a mask is for personal protection. Wearing a mask with a safety valve can be said to be safe, comfortable and convenient. 2. Main technical parameters Item Nameexhalation valve P2 MaterialNonwoven TypeHead-wearing Standard FFP2 Applificationconstruction, public places Key Wordsanti pollution mask, mask n95, disposable dust mask, valved ffp2 dust mask, custom printed ffp2 mask ,exhalation valve ffp2 dust mask , dust pocket mask ,air pollution masks Package10pcs/box,20box/carton PaymentT/T, 30% deposits;70% balance before delivery 3. Product advantages 4. Wearing method 5. Manufacturing environment 6. Certification 7.FAQ 1. What鈥檚 the function of the exhalation valve? To reduce the exhalation resistance of the respirator. 2.What kind of people are suitable to wear KN95 mask with valve? Healthy people to prevent virus. 3.Why infected people do not suit to wear KN95 mask with valve? Valves can expel droplets or bacteria from mask wearers, potentially threatening the health of others.cheap Mask website:http://www.shu-lan.com/protective-products/mask/