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The Aprilaire Model 600 Whole-House Humidifier features a manual control plus a built-in bypass damper which means fewer parts to install. The bypass damper is conveniently labeled for both summer and winter settings allowing you to set it for the entire season with no guesswork involved. The Aprilaire Model 600 Whole-House Humidifier is simply the best performing bypass humidifier on the market. Features: The same performance benefits of other Aprilaire Humidifiers. Delivers up to 50% more moisture in comparison to competitive units. Has an evaporation capacity of 0.70 gallons per hour. Humidifies tightly-constructed homes up to 4000 square feet in size. Has an evaporation capacity of 0.70 gallons per hour.