Blueair Air Purifier Filter Cartridge, Composite B45400 Model Suitable for 5410i/5440i, Removes Formaldehyde And Odors, Filter [Accessory]

3. Remove the plastic protective film from the new main filter before use

4. Remove the old main filter and dispose of it

5. Insert the new main filter

6. Press and hold the airflow speed button for 15 seconds

7. Ensure the filter compartments are properly closed to reset the filter timer

8. Close both filter compartments and plug in the power cord

Blueair, a Swedish brand, has been focusing on air purification for 27 years

Over 88 billion units sold since 2013

3-5 years quality guarantee

Complies with strict quality standards and tests

Blueair founder Bengt Rittri's dedication to creating the best air purifiers for clean air

Global recognition with users in 60+ countries and regions

Certified as a "Benefit Corporation" for social and environmental responsibility

Winner of 10+ authoritative certifications and 30+ industry awards, including AHAM, ENERGY STAR, and Red Dot Design Award