Unlike evaporative humidifiers that use a wick and a fan, an ultrasonic humidifier uses a metal diaphragm (vibrating at an ultrasonic frequency, typically 1.7 MHz) to break water into a cool, invisible mist. Equate models are popular because they are:
: Dims the indicator lights by 70% and defaults to low-speed mist. Essential Maintenance & Cleaning equate ultrasonic humidifier user manual
Weekly