Filters bacteria and debris present in the water before they enter the air. The 30 mm thick cellulose fiber filter made of 12 layers ensures efficient and consistent humidification performance for up to 6 months per filter. 12-layer honeycomb structure for optimal water absorption and evaporation efficiency. Compatible with Philips humidifiers HU4801/01, HU4803/01, HU4803/70, HU4811/10, HU4811/30 , HU4811/60, HU4811/90, HU4813/10, HU4814/10 - Compatible with FY24 01 filter /30 (replaces FY240 ) 1/10) Package content: 5 x Humidifier Filter Note: The data is all measured manually, please allow an error of 1 to 3 cm. Due to differences in light and display, there may be color differences, please refer to the actual item received.