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What are the functions and benefits of a humidifier: The main function of a humidifier is to increase air humidity and moisturize dry air. Dry air can easily trigger respiratory infections such as asthma. Humidifiers protect the human body and reduce the risk of respiratory infections. If the environment is too dry, furniture will accelerate its aging rate. Humidifiers can increase the humidity in the air, allowing furniture to be stored and used longer. The hot summer can accelerate skin aging, and humidifiers can promote blood circulation.