Product Description About 1,000,000+ families and 38,000,000+ peoples suffering adverse reactions such as coughing, sneezing, and difficulty breathing. Special Silver Filter Layer: Customized for dust and pet dander with a coating that has a special treatment for pollen and pet odors, filters any harmful particles. 4-in-1 Filter Prevent Clogging: When hairs, dander, and other large particles meet the pre-filter layer, they will be blocked outside to prevent the air purifier from clogging. High-Efficiency Filtration for FreAire KN6391 Air Purifier Filter Replacement: High-Efficiency filter layer is used, it can filter airborne particles such ao smoke, hair, dander, smell. Special Note:The FreAire KN6391 air filter is from LongSheng,used in the description is only intended to be a true statement of compatibility with other brand Filter or other brand air purifier.   and the FreAire KN6391 filter is not an OEM Filter product of another brand PERFECT COMPATIBILITY : Our FreAire KN6391 replacement filter is compatible with ToLife TZ-K1 air purifiers, FreAire 6391RGB & HAP601 air purifiers, MK01 air purifiers and MK06 air purifiers.; Work just like the one that come with unit. Please check your model before making an order. 3-in-1 FILTRATION: Our FreAire KN6391 replacement filter compatible with FreAire air purifiers is high-efficiency 3-in-1 True HEPA filtration systems including Ultra-fine Pre-Filter, H13 Grade True HEPA Filter,and Activated Carbon Filter. They work together to capture up 99.97% of all airborne particles down to 0.3 microns in the air like dust, hairs, pet fur, lint, and prolongs the life of HEPA filter for TZ-K1 air purifier to keep clean from dust, pollen, smoke particles, pet dander, creating fresh. HIGH PERFORMANCE: The FreAire KN6391 H13 HEPA filter for tolife air purifier can effectively remove airborne particles, improving the quality of indoor air and making people breathe freely; The high-grade activated carbon filter can efficiently absorb unwanted odors, fume, smoke, and cooking smells, as well as filter pet odors in your living space for improved air quality, ideal for pet owners, smokers, and people who live in cities. WARM MAINTENANCE TIPS: Just need to remove the packaging of the filter, then place it into your mahcine for ToLife air purifier FreAire KN6391.; And its lifespan varies to the existing air conditions, it is recommended to replace it once for 3-6 months. BUY WITH CONFIDENCE: We value customer service and satisfaction. If you have any problems with the filter fitting your air purifier, please contact us. We value each customer, and our after-sales team will provide each customer with satisfactory service.