Aprilaire Water Panel 35 for Humidifiers is an essential component designed to enhance the performance of your whole-house humidifier. This water panel, also known as the Aprilaire humidifier filter, water pad, or evaporator pad, features a durable expanded aluminum honeycomb mesh coated with a special clay that absorbs and retains water effectively. As warm, dry air passes through this filter, it s into water vapor, which is then distributed throughout your home to maintain optimal humidity levels. By increasing indoor humidity to a comfortable range between 30% and 50%, this water panel helps relieve common symptoms caused by dry air such as dry skin, bloody noses, and itchy eyes. Especially during colder months when the air tends to be dry, the Aprilaire Water Panel 35 ensures your living environment remains comfortably moist and healthy. Model Number: 35