Function traits: 1. Models: Wall Hanging/Cabinet/Ceiling Mounted/Moveable. 2. Initial effect and middle effect filter 3. High-strength C-UV tube up to 15,000uw/square cm with leakage less than 1uw/square cm. 4. Stainless disposable filter net 5. Photocatalyst filter 6. Mighty activated carbon deodorizing film 7. High tension electro-static absorption 8. Oxygen anion generator 9. Automatic ultraviolet intensity and environment temperature detecting device 10. Automatic ultraviolet lamp error alarm 11. Automatic filter expiry alarm 12. Automatic fan error alarm. 13. Automatic accumulated contamination alarm. Application scope: Operating room, maternity ward, infant room, premature infants room, germ-free area of supplying room, Department of Burn, ICU and common sickroom, etc.