Xiaomi Smart Air Purifier 4 Filter

The primary filter provides an initial filtration by filtering dust, hair, fine crumbs among other large particles and is resistant to creases, oil, acids, alkalis and more to ensure a long service life.

Xiaomi’s High Efficiency Filter

99.97% filtration of 0.3μm particles*The 22000cm² high-efficiency filter * removes PM2.5, pollen etc. for consistent clean-air output.

High-quality impregnated activated carbon

Powerful odour adsorption

The 500000mg high-quality activated carbon*, with the sophisticated pore structure and evenly distributed carbon, effectively removes air pollutants and odour that are harmful in your home.

The difference between Xiaomi’s High-Efficiency Filter and a conventional HEPA Filter

Combining two filter technologies: Electrostatic charge and mechanical filtration, Xiaomi’s High Efficiency Filter media can remove 99.97% of airborne particles of 0.3 micrometers in size and traps dust, PM 2.5, pollen, pet dander, smoke and tiny particles. Compared to a conventional HEPA filter, Xiaomi’s High Efficiency Filter allows the air purifier to generate less noise and consume less energy by allowing more airflow to pass through the filter all the while keeping the same cleaning efficiency.

The all-in-one filter element is durable, though performance will gradually decrease over time. It is recommended to replace the filter element every 6–12 months.