... dust can be filtrated Air filter description:Air filter on the front side, an active carbon filter pad on the back to ... HEPA Pad materials are available in six types: PP filter paper, glass fiber, compound PP+PET filter paper, meltblown+polyester non-woven, meltblown+glass ... not released into the air again.Air filter Application:1). Air HFPA purifier, air filter bags etc.2). Medical nano silver mask ...