Please kindly noted that this item is sold by Nanjingkangchen from Joybuy marketplace. Product Description: C102 True HEPA Replacement Filter C102 True HEPA Replacement Filter 6.9*5.2 inches Package of 2 * C102 replacement filters. Recommended to change the filter every 3 months, or depends on daily usage and air quality. C102 True HEPA Replacement Filter: Compatible with air purifier model C102 and also compatible with MA-18 air purifier.: 3-in-1 True HEPA filtration system Pre-Filter, H13 True HEPA Filter, and Activated Carbon Filter. Pre-filter: Traps larger particles in the air like dust, hairs, pet fur, lint and prolong the life of HEPA filter. H13 True HEPA Air filter features an efficient filtration system, powerful enough to captures up dust, pollen, pet dander. High-Efficiency Activated Carbon Filter neutralizes household odors from pets, cooking, smoke, and harmful VOC's. Meeting Room: Large Particles Mold Spores & Pollen Sinusitis Kitchen: Cigarette Fumes Cigar Fumes Household Dust Living Room: Pet Odor Pet Hair & Dander Pet Allergens Bedroom: Cigarette Smell Home Renovations VOC & Odors Perfect fit for C102 Filter Replacement, compatible with Okaysou AirMic4S and C102 IBuki Air Purifier Package includes 2 C102 True HEPA Replacement Filters Recommended to change the filter every 3 months, depending on daily usage and air quality 3 in 1 True HEPA filtration system includes: Pre Filter: Traps larger particles in the air like dust, hair, pet fur, and lint, prolonging the life of the HEPA filter