An ultrasonic humidifier is disclosed including a chamber, an ultrasonic transducer positioned at the bottom of the chamber, a passage in fluid communication with the chamber, a duct having an inlet and an outlet, the duct being in fluid communication with the passage by way of a passage outlet, a fan positioned in the duct and disposed between the duct inlet and the passage outlet. The fan is configured to propel air through the duct and over the passage outlet such that vapors in the chamber may be drawn into the duct.