- Package includes four True HEPA Filters (10 x 4.6 x 1.37 inches each). These filters replace Filter A, Filter D, and Filter K to ensure your air remains clean and fresh. For optimal performance, replace filters every four months. - Compatible with a range of Holmes models including CAP531-U, CAP529-U, HAP240, HAP242, HAP412, HAP422, HAP424, HAP706, HAP716, HAP9240, HAP9242, HAP9412, HAP9414, HAP9422, HAP9424, and HAP1200. - Also fits various Bionaire models such as HAP412, HAP422, HAP424, HAP702, HAP706, HAP716, HAP1702, HAP2400, HAP9240, HAP9241, HAP9242, HAP9243, HAP9412, HAP9413, HAP9414, HAP9415, HAP9422, HAP9423, HAP9424, HAP9425, as well as BAP260, BAP520, BAP815, BAP825, BAP9200, BAP9417, BAP9427, BAP9435, and BAP9700. - Made from high-quality materials, these filters boast a durable construction that ensures long-lasting performance and maximum effectiveness. They effectively capture allergens, dust, and pollutants, improving indoor air quality in homes, offices, or any enclosed spaces. - Whether you suffer from allergies, have pets, or simply want to maintain a healthier living environment, these HEPA filters provide the reliable air purification you need. Ideal for regular use in any room with compatible air purifiers to create a fresher and healthier atmosphere.