Compatible: Upgraded Classic 400 Series Replacement Filter,Compatible with Blueair 400 Series Air Purifier Replacement Filter, part# 480i,402,403,405,410,455EB,450E Replacement Filter Filter material: Compatible with Blueair 400 Series Replacement Filter Use high grade H13 HEPA and Activated Carbon to Help treat 99.97% of Airborne Particles Down to 0.1 Micron in Size, Effectively Filtering and Purifying air Quality. Applicable scenario: Compatible with Blueair Classic 400 Series Filter,Can Be Used in the Room,Office,Living Room, Bedroom,Children's Room,Kitchen,Creating Fresh Air for Your Home, A Warm Home. Easy to replace: Men and women can replace the 403 filter replacement independently without tools. In order to ensure the filtration effect, we recommend that you change every 6 to 8 months according to the usage. After-sales service: Compatible with Blueair 400 Replacement Filter provides 6 months of quality assurance. Please contact us if you have any questions. We provide services 24 hours a day to do our best to solve the problem.

Upgraded Classic 400 Series Replacement Filter,Compatible with Blueair 400 Series  Air Purifier Replacement Filter, part# 480i,402,403,405,410,455EB,450E Replacement Filter Cotton,

HOW TO REPLACE? 

 1. Unplug the Air Purifier, and Remove the Compatible with Blueair 400 Series Replacement Filter cover. 

2. Remove the old Compatible with (Blueair Classic 400 Series Filter) and properly dispose them. 

3. Unwrap the new (403 filter replacement), place it into the housing with the pull tabs facing out. 

4. Properly replace the filter cover onto the housing. 

5. Plug in and turn on the air purifier. 

6. Reset the air purifier by pressing and holding the "Change Filter" symbol for 3 seconds.