Works with the following Bionaire models, BAP260, BAP520, BAP815, BAP825, BAP9200, BAP9700, BAP9800. Works with the following Holmes models, HAP242, HAP412, HAP422, HAP424, HAP702, HAP706, HAP716, HAP1702, HAP2400, HAP9240, HAP9242, HAP9243, HAP9412, HAP9414, HAP9415, HAP9422, HAP9423, HAP9424, HAP9421, HAP9413, HAP9425 (some products may use 2 filters).