The H13 Allergen Filter Replacement (CACFS-R12M03US) is a compatible air filter for the 3-Stage Filtration H13 True HEPA Air Purifier (CAC-R1510FW), providing advanced air purification for medium to large spaces. CAC-R1510FW Air Purifier 3-Stage Filtration System: Pre-Filter – Captures dust, pet fur, and larger particles while extending the lifespan of the filter. Activated Carbon Deodorization Filter – Helps remove unpleasant odors and harmful gases, including those from food, cigarettes, pet fur, nitrogen dioxide sources, and bathrooms. H13 True HEPA Filter – Filters mites, pollen, fine dust, and cigarette smoke. Filter Bundle: Pre-Filter, Activated Carbon Deodorization Filter, and H13 True HEPA Filter. Filter Replacement & Maintenance: Pre-Filter – Wash with water every 2–4 weeks. Activated Carbon Deodorization Filter – Replace every 3 months. H13 True HEPA Filter – Replace every 1 year. *Replacement cycles may vary depending on usage and environment. *Lifespan dependent on how many hours the unit operates per day (i.e. running the unit 24 hours per day will result in a shorter filter lifespan)