Features: This replacement filter captures 99% of particles including dust, ensuring optimal compatibility for 511 air purification. The triple layer filtration combines mechanical, electrostatic to trap contaminants while preventing microbial growth, featuring plastic frame for easy installation. Ideal for households with children, seniors, or allergy sufferers, this filter serves pet owners and office environments by effectively neutralizing odors and maintaining consistently clean indoor air quality. Perfect for areas like living rooms, bedrooms, and workspaces, it actively reduces PM2.5 and seasonal for uninterrupted air circulation. Designed to last 6 months with regular use, this filter delivers superior particle retention compared to standard single layer alternatives, requiring fewer replacements over time. Specifications: Component:Plastic Size:Approx.38x24cm/14.9x9.44inch Package Includes: 2Pcs Air purification Filter note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.