Description: This humidifier filter is designed to prevent growth and migration of mold, fungus, algae, and bacteria. It is made of high-quality wood pulp paper, very safe and healthy to use. 2 types humidifier filter could be for you to choose to match your humidifier, HU4101 is suitable for Philips HU4901/HU4902/HU4903, HU4136 is suitable for Philips HU4706/HU4701/HU4702/HU4703. Features: Made of high quality wood pulp paper, environmental-friendly, safe and healthy to use. Protecting treated filter inhibits up to 99% of mold growth and removing minerals and pollutants from water. Antimicrobial treatment helps prevent the growth and migration of mold, fungus and bacteria in the filter. Very easy to use and simple to install. 2 types of humidifier filter replacement: HU4101 and HU4136, HU4101 is suitable for Philips HU4901/HU4902/HU4903, HU4136 is suitable for Philips HU4706/HU4701/HU4702/HU4703, you could choose the one to match your humidifier. Specifications: Condition: 100% Brand New Material: Wood pulp paper Color: White Type: HU4101, HU4136 (Optional) HU4101 Suitable for: Philips HU4901/HU4902/HU4903 HU4136 Suitable for: Philips HU4706/HU4701/HU4702/HU4703 Usage: Water filtration Lifespan: 1-2 years Aperture Ratio: 90% HU4101 Size: Approx. 26 x 14 x 4cm / 10.2 x 5.5 x 1.6inch HU4136 Size: Approx. 13 x 16 x 4cm / 5.1 x 6.3 x 1.6inch (Shown as Picture) Weight: Approx. 45g-80g Package Included: 1 x Humidifier Filter Replacement