Honeywell HE280A2001 HE280A Whole House Humidifier, White Water-saving technology uses 30% less water than standard models Easy mounting on either warm air supply or return air duct of any forced-air furnace Flow through design helps keep unit clean of microorganisms and decreases the frequency of maintenance PerfectFLO water distribution optimizes efficiency and water usage Protects wood floors and furnishings from drying and cracking