Features: 1Filter Element: Can effectively remove large particles in the air common pollutants including dust particles pollen smoke odor pet dander etc. 2High Efficiency Particle Filter: Fine filter reduce the unnecessary odor in the living space provide you with a clean living space improve the living experience. 3Correct Seal: The filter is sealed to protect its service life. You are advised to replace the air filter periodically. To keep your machine fresh and clean for best results remove the filter once a month and clean with a soft brush or light vacuum the filter reduces chemicals volatile organic compounds fumes and removes common household odors. 4Simple Installation: No particularly complex operations are required providing a comfortable life for you and your family changing in minutes without the need for special tools. 5Usage Scenario: for Blueair air purifier filter 203 270E 303 composite filter element you can choose according to your equipment model. Specification: Item Type: Air Purifier Filter ReplacementWeight: 1757g/62ozMaterial: High Efficiency Particulate AirSize: 37 x 46 x 5cm/14.6 x 18.1 x 2in Package List: 1 x Filter Note: Please remove the new filter from the plastic bag before putting it in.