Replacement Filter for Air Purifier 400S (Part Number: 400S-RF) – H13 Filtration, 5-Layer Design Please verify your model number to ensure compatibility. This filter is designed for the Air Purifier 400S and 400S-RF models and functions identically to the original filter included with the unit. Cost-Effective Replacement: A value pack option helps reduce long-term maintenance costs. For optimal performance, replace the filter every 6–12 months. Using a worn or expired filter reduces air purifier efficiency. H13 True HEPA Filtration: Captures 99% of airborne particles as small as 0.3 microns. Provides 360-degree filtration to help improve indoor air quality. Activated Carbon Layer: Helps reduce common household odors—including cooking smells, pet odors, tobacco smoke, and volatile organic compounds (VOCs). Easy Installation: Designed specifically for the 400S model—no cutting or modification required. Simple, tool-free replacement. Color: White Material: Composite Package Includes: • 1 x Air Purifier Filter • 1 x Cleaning Brush Note: Actual product color may vary slightly due to lighting conditions and screen settings. Dimensions are subject to a tolerance of ±1–3 cm.