[Perfectly Compatible with 600 Series]: The HEPA replacement filter is compatible with AC0650/10, AC0651/10, and 600 series air purifiers, part number FY0611/30. Please confirm the machine model before purchase to avoid incompatibility. [3 STAGE FILTER SYSTEM]: The replacement filter is suitable for FY0611 air purifiers and features an effective 3-stage filtration system (① Ultrafine nylon pre-filter ② H13 true HEPA filter ③ Activated carbon filter), capable of capturing 99.97% of airborne particles with a filtration efficiency down to 0.3 microns. This helps reduce chemical volatile organic compounds (VOCs), tobacco smoke, PM2.5, and common household odors. [Household Use]: The fine mesh layer captures large particles such as dander and pet hair, while also trapping dust, pollen, smoke, and other small particles. Within weeks, visible reduction in pet hair and dander can be observed. The high-efficiency activated carbon filter contains additional activated carbon particles to effectively absorb odors, making it ideal for allergy sufferers, pet owners, and households with smokers. [REGULAR REPLACEMENT]: Replacement filter dimensions: 7.3 inches (L) x 7.3 inches (W) x 6.8 inches (H), designed to fit fully within 600 series air purifiers. For optimal performance, we recommend replacing the filter every 4 to 6 months. Color: As Shown Material: Plastic Package Contents: 1 x Filter Note: Light reflection and display settings may cause slight variations between the color shown in the image and the actual product. Measurement tolerance is +/- 1-3 cm.