●【Compatible with】Water panel compatible with Aprilaire Humidifier Model:400, 400A, 400M & Perfect Diamention: 10" H x 13" L x 1.75" W ●【Easy to Install】45 Humidifier Water Panel Easier installed, in addition you feel more comfortable while also preserving items in your home susceptible to damage from changing humidity or dry conditions. ●【Humdity for Comfort】Humdity for health humidifier filters can help you maintain optimal humidity in your home of 35% – 45% which has been shown to improve the family life. ●【Premium Water Panel Replacement】Filter design maximizes moisture output from the humidifier. Premium value pack kit helps you replace your filters. These filters are ideal for anyone who needs a clean and effective humidifier experience. ●【Excellent Value】 You will get 2 humidifier filters. 200% more filters than others that only include 1 filter. This complete value pack provides enough clean filters to improve the air in your home.