[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 a 3-stage filtration system (ultrafine nylon pre-filter, H13 true HEPA filter, activated carbon filter), capable of filtering 99.97% of airborne particles with a filtration efficiency down to 0.3 microns. Effectively reduces 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. Visible reduction in pet hair and dandruff can be observed within two months. The high-efficiency activated carbon filter contains additional activated carbon particles to better absorb odors, making it an ideal choice for allergy sufferers, pet owners, and smokers. [REGULAR REPLACEMENT]: Replacement filter dimensions: 7.3 inches (L) x 7.3 inches (W) x 6.8 inches (H), fully compatible with 600 series air purifiers. For optimal performance, replace the filter every 4–6 months. Color: As Shown Material: Plastic Package Contents: 1 x Filter Only the above package content is included; other products are not included. Note: Light reflection and differences in display screens may cause slight color variations between the image and the actual item. Measurement allowance is +/- 1–3 cm.