This Filter-Monster combo pack is designed for AirDoctor 5000 and 5500 air purifiers and includes 2 HEPA filters and 4 carbon filters to deliver comprehensive air cleaning performance. The HEPA filter captures 99.97% of airborne particles as small as 0.3 microns, while the carbon filters help reduce odors, smoke, and volatile organic compounds. For best results, it is recommended to replace the carbon filters every 6 months and the HEPA filter every 12 months, or more often depending on air quality and environmental factors, ensuring your purifier continues to provide fresh, clean air throughout your home. Filter Monster brings over 25 years of expertise in delivering filtration solutions that help customers enjoy cleaner, healthier air with trusted performance, reliability, and value. Features and benefits: