- Compatibility: HAP603 filters are compatible with HAP603 and HAP603WF air purifiers. Make sure your machine model is correct before buying. - 3-in-1 filtration system: HAP603 replacement filter adopts a 3-in-1 filtration system, including a nylon pre-filter, an H13 true HEPA filter, and a high-efficiency activated carbon filter. It can filter 99.97% of airborne particles as small as 0.3 microns. - Activated carbon technology: The activated carbon in the HAP603 replacement filter effectively absorbs and purifies various large particles and smoke from the air, helping to keep interior space fresher. - Cost-effective replacement pack: The package contains 2 replacement filters for HAP603. We recommend replacing the HAP603 air filter every 3 months for optimal performance. - Benefits and performance: Improves overall air quality by capturing fine particles, reducing odors and smoke, and maintaining a cleaner living or working environment. - Use scenarios: - Home with pets or allergy-prone individuals to reduce dust, dander, and odors in living rooms or bedrooms. - Small office or work area to maintain a cleaner, odor-free workspace. - Kitchen or dining area to minimize cooking smells and smoke for a more comfortable environment.