... dust can be filtrated Air filter description:Air filter on the front side, an active carbon filter pad on the back to ... materials are available in six types: PP filter paper, glass fiber, compound PP+PET filter paper, meltblown+polyester non-woven, meltblown+glass ... HFPA purifier, air filter bags etc.2). Medical nano silver mask, exposure suits, hygiene necessities.Remark:1.Design and Material can be ...