- Package includes 4 True HEPA Filters (each measuring 10 x 4.6 x 1.37 inches). These filters replace Filter A, Filter D, and Filter K. To maintain optimal air quality, it is recommended to replace the filters every 4 months. - Compatible with a variety of Holmes Air Purifier models, including CAP531-U, CAP529-U, HAP240, HAP242, HAP412, HAP422, HAP424, HAP706, HAP716, HAP9240, HAP9242, HAP9412, HAP9414, HAP9422, HAP9424, and HAP1200. - Also fits numerous Bionaire models: HAP412, HAP422, HAP424, HAP702, HAP706, HAP716, HAP1702, HAP2400, HAP9240, HAP9241, HAP9242, HAP9243, HAP9412, HAP9413, HAP9414, HAP9415, HAP9422, HAP9423, HAP9424, and HAP9425. Additionally compatible with BAP260, BAP520, BAP815, BAP825, BAP9200, BAP9417, BAP9427, BAP9435, and BAP9700. - Crafted from high-quality materials, these filters are designed for durability and long-lasting performance. Their robust construction ensures efficient air filtration, helping to maintain a cleaner and healthier living environment. - Ideal for households with pets, allergy sufferers, or anyone looking to improve indoor air quality. Regular replacement of these HEPA filters can significantly reduce allergens, dust, and odors, providing a fresher home atmosphere. - Use these filters in conjunction with your air purifier during allergy seasons or in areas with high air pollution to effectively trap harmful particles and promote better respiratory health.