Aprilaire 400M Whole-House Humidifier for Homes up to 5,000 Sq. Ft.

Back in 1954, AprilAire introduced the first evaporative humidifier designed for forced-air furnace systems. Since then, the company has continued to lead the industry in whole-home humidification solutions. AprilAire's evaporative humidifiers work by piping water into a distribution tray at the top of the unit. The water is evenly distributed across the tray and through a scientifically engineered system of outlets. The water then flows by gravity over the Water Panel evaporator. Dry, hot air from the HVAC system is moved through the moisture-laden Water Panel, where natural evaporation takes place. The resulting humidified air is then circulated throughout the home.

The unique design of these humidifiers ensures that 100% of the water entering the unit is evaporated. This is achieved through a special two-stage float system that maintains the optimal water level and protects against overflow. In the unlikely event of a float system failure, it is recommended to install an overflow tube (with a 1/2-inch inner diameter) that runs from the base of the humidifier to a condensate pump, sink, or floor drain.

Proper maintenance is essential for the optimal performance and longevity of these humidifiers. Users should follow the provided maintenance instructions carefully.

The humidifier package includes: - Installation instructions and template - Humidifier with a built-in bypass damper - 24 VAC transformer - Manual humidifier control with sensor - Saddle valve - Solenoid valve - Model #45 Water Panel

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