In by Jackie Dunn

A device designed to increase the humidity within a room or a house by means of the discharge of water vapor. It may consist of an individual room-size unit or a larger unit connected to the heating plant to condition the entire house.

Merriam-Webster Online Dictionary
humidifier (noun)
a device for supplying or maintaining - humidity
humidifier (Wikipedia)
Humidifier in an art museum in Augsburg, Germany

A humidifier is a device that increases humidity (moisture) in a single room or an entire building. In the home, point-of-use humidifiers are commonly used to humidify a single room, while whole-house or furnace humidifiers, which connect to a home's HVAC system, provide humidity to the entire house. Medical ventilators often include humidifiers for increased patient comfort. Large humidifiers are used in commercial, institutional, or industrial contexts, often as part of a larger HVAC system.

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