Indoor Environment: Effectively removes impurities from water, clean for a more pleasant home mood, designed for V3100, V3500, V3700, V3800, and V3900 humidifiers Humidity: Produces fine for faster enhancement, alleviating dry air discomfort in cold weather or low humidity regions for home comfort Sturdy Construction: Made from resilient synthetic fibers with excellent filtration capacity, capturing tiny particles while microorganisms to reduce buildup : Engineered to work with V3100, V3500, V3700, V3800, and V3900 series humidifiers for seamless replacement and optimal action without sizing issues Easy Maintenance: intelligent planning allows effortless replacement every 3 6 months to maintain better filtration and humidity output with straightforward setup