Package Included: (Optional) #1 1 x Disposable Ultra Fine Filter #2 1 x Reusable Standard Filter #3 4 x Disposable Ultra Fine Filters #4 3 x Reusable Standard Filters #5 (Half-year Quantity) 6 x Disposable Ultra Fine Filter 2 x Reusable Standard Filter Features: 1. Effectively filter PM2.5 and fine particle dust to better protect the health of patients. 2. Block fine dust in the air, provide better quality air and improve the treatment effect. 3. Filter the air that has entered the ventilator, remove the harmful dust and particles in air, ensure better intake of air. 4. Disposable light blue ultra-fine filter cotton, it is recommended to replace 1-2pcs every month. 5. Reusable filter cotton, it is recommended to replace one piece in 3-6 months. 6. The half-year quantity contains 6 pcs of Disposable Ultra Fine Filter + 2 pcs of Reusable Standard Filter. 7. Regular replacement to guarantee clean air, ensure patients to get effective and safe treatment. Specifications: Item Type: Filter Cotton Material: Sponge Color: As Pictures Show Storage Condition: Dry and avoid direct sunlight