Standard Features - Easy Mounting - On either warm air supply or return air duct of any forced-air furnace - Flow Through Design - Helps keep unit clean of microorganisms and decreases the frequency of maintenance. - PerfectFLO Distribution Tray - Optimizes efficiency and water usage - Installation video included - Drain Is Required - Easy-To-Use Humidity Control Included - Installation kit available - Model: HE220A - 1-Year Warranty