Whole house humidifier, manufactured by Skuttle Corp. This model was designed with ease of service in mind. Installed under the supply or return horizontal duct of a forced air furnace, this model utilizes air flowing through the duct system to pick up moisture. Can be mounted on duct as small as 12 wide x 8 high. The flow through design constantly flushes away trouble causing minerals not deposited on the replaceable water panel and provides exactly the right amount of moisture in vapor form.