Humidifier

A device that adds water vapor or fine droplets to indoor air, raising its humidity. Humidifiers range from simple evaporative designs to ultrasonic and steam-producing machines.

Evaporative humidifier: A humidifier that moves air through a wetted wick or filter so water evaporates into the airflow. Its self-limiting evaporation and lack of intentional mineral aerosol distinguish it from mist-producing designs.
Indoor air quality: The condition of air inside buildings, shaped by pollutants, ventilation, humidity, and other factors. Humidifiers alter one part of indoor air quality and can introduce airborne contaminants if poorly maintained.
Humidifier lung: A form of hypersensitivity pneumonitis caused by inhaling contaminated aerosols from humidifiers or similar devices. Contaminated humidifier mist can trigger lung inflammation in susceptible people.
Dehumidifier: A device that removes water vapor from indoor air to lower its humidity. It reverses a humidifier’s basic effect when indoor air is too damp.
Water vapor: Water in its gaseous state, present in air as an invisible component of the atmosphere. Humidifiers raise humidity by adding water vapor directly or by dispersing droplets that later evaporate.
Ultrasonic humidifier: A humidifier that uses high-frequency vibration to disperse water as a fine aerosol. Its vibrating transducer creates cool mist without boiling water.
Dry eye: A condition in which tears do not adequately lubricate the surface of the eye. Higher indoor humidity may ease some symptoms associated with dry environments.
Hypersensitivity pneumonitis: An immune-mediated lung disease caused by inhaling certain environmental antigens. Humidifier lung is one exposure-related form of this broader disease.
Air purifier: A device that removes or reduces airborne particles and other pollutants. Unlike humidifiers, air purifiers target contaminants rather than adding moisture.
Evaporation: The change of a liquid into vapor at its surface, occurring below the boiling point. Evaporation is the moisture-transfer process in wick-based humidifiers.

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