[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 your machine model before purchase to ensure compatibility. [3 STAGE FILTER SYSTEM]: This replacement filter is designed 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 capturing 99.97% of airborne particles as small as 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 microscopic allergens. Visible reduction in pet hair and dander can be observed within two months. The enhanced activated carbon filter contains additional activated carbon for superior odor absorption, making it ideal for allergy sufferers, pet owners, and households with smokers. [REGULAR 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: Other items not included. Lighting and display settings may cause slight color variations between the image and the actual product. Measurement tolerances may vary by +/- 1-3 cm.