[Perfectly Compatible with Philips 600 Series]: The HEPA replacement filter is compatible with Philips 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 Philips FY0611 air purifiers and features a 3-stage filtration system (① Ultrafine nylon pre-filter ② H13 true HEPA filter ③ Activated carbon filter), capable of filtering 99.97% of airborne particles with a filtration efficiency of 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. Noticeable reduction in pet hair and dander 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 Philips 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 differences in display screens may cause slight variations in color between the image and the actual item. Measurement error allowed is +/- 1-3 cm.