We are the manufacture of HEPA filters and its materials, our quality is good, and price competitive! We ... welcomes your RFQ! HEPA Filters made by our filter materials, cartridges, activated carbon, photo-catalyst, cold catalyst, nano- ... ammonia, fluorine, formaldehyde, methanthiol, hydrogen sulfide etc. Also, its super strong on sterilizations, ordinary bacteria, stubborn bacteria and fungus ...