1. Material:Be made up of high quality filter paper and durable plastic frame,keeping it working for a long time. Product size: 10 x 4.6 x 1.2 inch.
2. Evidently improves the air quality.
3. Compatible with Holmes Units: CAP531-U, CAP529-U, HAP240, HAP242, HAP412, HAP422, HAP424, HAP706, HAP716, HAP9240, HAP9242, HAP9412, HAP9414, HAP9422, HAP9424;Compatible with Bionaire Units: BAP260, BAP815, BAP825, BAP9200, BAP9700, BAP520.