Honeywell HM506H8908 Truesteam Humidifier, 6-Gallon Application flexibility - Mount directly to the duct or remotely up to 20 feet away into tight-fitting or unconditioned air spaces Installs in minutes - Limited duct cutting and bracket-mount design takes less than 5 minutes to complete Easy maintenance - Self-regulates cleaning cycles throughout the year. Annual maintenance requires no tools to access and clean, saving time and money on annual contractor service calls