The Model 400 automatic humidifier uses a patented delivery method, which includes a small float chamber.

The Model 400 automatic humidifier uses a patented water delivery method, which includes a small float chamber, electronic water level sensors, and a wicking water panel. The use of the float chamber eliminates the need for a reservoir. The wicking water panel allows all the water in the unit to be used in the evaporation process, with virtually no standing water. The unit uses a maximum of eight ounces of water to evaporate. The Model 400 comes with a built-in bypass damper and automatic humidifier control. It replaces Aprilaire Models 445 and 448.

Research Products Corp., P.O. Box 1467, Madison, WI 53701-1467; (608) 257-8801; fax (608) 257/4357.

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