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Thank you for your inquiry. Cool mist ultrasonic humidifiers produce mist using a nebulizer in the base that vibrates at ultrasonic speeds. This differs from an evaporative cool mist humidifier, in which water is wicked up from the base into a porous filter pad, and air blowing from the fan through the pad evaporates the moisture into the air. If you require additional assistance, please reach out to us by emailing SocialSupport@helenoftroy.com.
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