The AprilAire Model 400M is a whole-house evaporative humidifier designed for tightly built homes up to 5,000 sq. ft.. It is a water-saving, drainless model that uses 100% of the water delivered to the system through a unique evaporative process, making it ideal for homes with septic systems. The humidifier has a capacity of 17 gallons per day and helps maintain optimal humidity levels to reduce respiratory issues and preserve home furnishings. It features a manual humidistat control, allowing you to set the desired humidity level in your home. The product is made with plastic and has a gray finish. It is designed to be installed in your central heating and cooling system's ductwork

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