Product Specification: Materials: Plant, Fibers 5x humidifier/air filter for Philips humidifier - customized air filter for your Philips humidifier - 100% absolute fit, s adapts perfectly to your model of humidifier - Prevents the growth and migration of mold, fungi, algae and bacteria - Material: natural honeycomb structure fibers - Thickness: 30 mm The replacement filter ensures optimal air humidification and impeccable hygiene and thus a more pleasant and healthier room climate. A clean filter binds pollution such as bacteria and lime from the water and prevents the spread of mold and spores in the surrounding air. The filter is made of natural fibers with honeycomb structure, which ensures absorption of water and thus better evaporation.&lt; br/&gt;&lt; br/&gt; Our tip: For your humidifier to work efficiently and hygienically, the filter should be cleaned regularly and, depending on use, replaced approximately every 3 - 6 months. Replaces: HU4102 HU4102/01 8815002 ACA-3E &lt; b&gt;Suitable for the following device models:&lt; /b&gt; Compatible with Philips 2000 series HU4801 HU4801/01 HU4802 HU4803 HU4803/01< br />HU4811 HU4811/10 HU4813 HU4813/10 HU4814 HU4814/10 Also suitable for Enviracaire , Honeywell units, Relion , Sunbeam , Vicks and similar units. &lt; br/&gt; < /div>