1.Perfect Compatible with MR5866 Air Purifier: air purifier replacement filters guarantee certified fit and optimal performance. Off-brand filters frequently fail HEPA testing standards, fit incorrectly, reduce efficacy, and may cause damage to your air purifier. Only when used in conjunction with a genuine filter will your purifier be strong and efficient 2.Two Filters Work Faster: The MR5866 air purifier is designed with dual side air intake, allowing two filters to work simultaneously from the front and back sides. This special design significantly increases the purification speed and effectively captures pollutants from all directions. filter replacements are engineered to refresh your air with high efficiency 3.Excellent Filtration Technology: 99.97% of airborne particles as small as 0.3 microns can be captured by our premium Grade True HEPA Filter, significantly enhancing the air quality in your house. You may breathe comfortably thanks to the honeycomb activated carbon particles' ability to absorb aromas, including smoking, fumes, and pet scents 4.Four-piece Package: This package comes with four genuine original true HEPA filters, saving you a significant amount of money on your year-round air cleaning needs. It's a perfect solution for cooking, pet-friendly homes, and smokers. The genuine air purifier replacement filter typically has a 2200 hour life. We recommend you to replace it every 6 to 8 months