3-STAGE FILTRATION: Pre-Filter and Premium True HEPA Filter removes 99.97% of airborne particles down to 0.3 Micrometre in size. Activated carbon filter efficiently removes household odors from pets, cooking, smoking, and VOCs. COMPATIBILITY: Ture HEPA Filter Replacement Compatible with for fillo allo air purifier. EASY TO INSTALL: The Filter Replacement is easy to be replaced and disposed of without any tool required. Ture HEPA Filter Replacement Replace every 3-6 months depending on the usage and environment. DIMENSIONS: Ture HEPA Filter Replacement: 6.41 inch x 6.41 inch x 3.81 inch. Simply remove the older and dirty Filter and replace re-secure the cover, in just 1 minute.