HY4866 three-stage filter system - Three-stage filter system includes H13 True HEPA, activated carbon, and a pre-filter. It captures 97% of pollutants in the air down to 0.3 microns, making it suitable for allergy sufferers and pet owners. Upgraded HEPA layer - Improved gas phase filtration medium expands the range of contaminants addressed, including dust and smoke, delivering cleaner air tailored to your needs. Electrostatic cotton layer - Electrostatic cotton enhances the ability to trap larger particles, extends filter life, and improves overall filtration efficiency for better indoor air quality. Activated carbon enhancement - More activated carbon neutralizes odors from pets and smoke, keeping your home fresh. Use scenarios - In bedrooms or nurseries to reduce allergens and improve sleep quality. - In homes with pets to control pet dander and odors. - In living rooms or kitchens to reduce smoke and cooking odors.