Features Applicable model: the activated carbon filter screen is suitable for the air purifier 211 and can directly replace the old or damaged filter elements. ACTIVATED CARBON The filter screen uses excellent activated carbon particles, which can safely and reliably reduce smoke, odor and pollutants. Foldable design: the filter elements of the air purifier are foldable, which makes installation and storage easier and saves a lot of storage space. Easy to replace: the foldable filter screen has a reasonable size and is convenient and practical to remove the old filter elements and replace with a new one. HIGH EFFICIENCY With exquisite workmanship, the air purifier filter screen has high filtration efficiency, perfect for home use, stable and reliable. Specification: Item Type:Air Purifier Filter Element Material: activated carbon Package list: 1 x filter element. Note: To improve the performance of the air purifier, please replace the carbon filter element every 6-8 months. Package List 1 x Filter Element