1. Compatible models: Suitable for FY2423/40 air purifiers and can provide replacement filter sets for models 2000 and 2000I. 2. True High - Efficiency Particulate Air (HEPA) filter: Capable of capturing particles as small as 0.3 microns passing through the filter. 3. Health beneficial: The true HEPA filter and activated carbon filter set may also remove ultrafine particles as small as 20 nanometers (i.e., 0.02 microns, 2500 times smaller than [the comparison object is missing in the original text]) from the air passing through the filter. 4. Activated carbon filter: It has a super - strong honeycomb structure, which can effectively reduce gases and odors in the air passing through the filter, making it suitable for people who want to improve air quality. 5. Well - sealed: The filter is sealed to ensure its service life. It is recommended to replace the air filter every 6 months. Take the filter out of the plastic packaging and then put it into the air purifier. 6. Color: Black 7. Material: Plastic 8. Dimensions: 36 x 4.5 x 27.5 cm 9. Package contents: - 1 HEPA filter - 1 activated carbon filter Only the above items are included in the package, and no other products are included. 10. Precautions: Light and different displays may cause slight differences between the color of the items in the picture and the actual product. The allowable measurement error is ±1 - 3 cm.