[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 including an ultrafine nylon pre-filter, an H13 true HEPA filter, and an activated carbon filter. It captures 99.97% of airborne particles with a filtration efficiency down to 0.3 microns, helping reduce chemical volatile organic compounds (VOCs), tobacco smoke, PM2.5, and common household odors. [Household Use]: The fine mesh layer helps capture large particles such as dander and pet hair, while also trapping dust, pollen, smoke, and other small particles. The activated carbon filter contains a high amount of activated carbon to effectively absorb odors, making it a great choice 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 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 differences may cause slight variations in color between the image and the actual item. Measurement tolerance is +/- 1-3 cm.