1. The use of electrostatic filter materials can effectively isolate particulate pollutants 0.2 microns in the air, and the dust filtration efficiency for particles 0.5 microns can reach over 95%. 2. Extend the service life of the filter: Effectively filters dust, pollen, and other airborne pollutants, helping to protect the filter elements from clogging. This can extend the life of the purifier filter by more than double, thereby saving on replacement costs. 3. Improve service life: The pre-filter used in the finished filter elements can effectively increase the service life of the original filter, allowing your filter to reach the manufacturer-specified lifespan. 4. Low wind resistance design: When the wind speed is 0.5 m/s, the wind resistance is as low as 3.5 Pa, ensuring it does not affect airflow or performance. 5. Compatible: This filter is compatible with Mi Air Purifier 1/2/Plus, and can be cut to fit air conditioners, windows, or electric fans. - Filters dust, PM2.5, and other airborne particles. - Designed to be used in conjunction with a HEPA filter, placed on the front of the HEPA filter to help extend its life. - Soft, non-toxic, odorless, and washable 1 to 2 times; avoid vigorous rubbing. - Suitable for modified air purifiers for household air conditioners, fans, air circulators, air conditioners, exhaust fans, and similar devices. - Size: 70 x 30 cm - Can be cut into at least two pieces for use in purifier filters; one piece can be used per application and customized as needed (one sheet can be divided into two for air conditioner filters). - Color: White - Material: Cotton - Package Contents: 40 x Filter cotton - Note: Light and display differences may cause slight color variations between the image and actual item. Measurement allowance is +/- 1-3 cm.