Filter,HEPA,active carbon,ari passage,fan and motor,installation board,TiO2 photo-catalyst,UV,baffe,Nano frame,dust sensor ... NM photocatalysis sterilization principle. Negative ion refreshes air. The swing head fan can send fresh air in the space evenly ... . Air passagel 5. HEPA 6. Centrifugal fan7. Motor 8. Electrical machinery shelf9. Installation board 10. Universal wheel11.Back cover 12.Socket13 ...