EASY-TO-CLEAN & COST-EFFECTIVE: Hassle-free filter replacement. The WOOZOO H13 True HEPA filter for APF-28 will last approximately 1.5 years, which means you can save about $40 - $200 on filters compared to competitor brand filters. The WOOZOO H13 True HEPA filters for APF-45 will last approximately 3 years, which means savings of about $127 - $460 compared to competitor brands. PROFESSIONAL-GRADE FILTERS: The H13-grade combination True HEPA filter removes 99.97% of dust, pollen, and other airborne particles and allergens (0.3 microns or larger) from the air with its powerful filtering mechanism, while the activated carbon filter absorbs strong household and cooking odors, smoke, and volatile organic compounds (VOCs). SAFE & TRUSTED: Manufacturer Approved; 100% Genuine; ETL listed, AHAM Verified, Energy Star Certified, CARB Certified, and CA Prop 65 Compliant. DIMENSIONS: 12.50"L x 2.50"W x 19.50"H