Where should I install my HE360 Powered Flow Through Humidifier?

The HE360 Powered Flow Through Humidifier can only be installed on the warm air supply of the furnace or air handler. This because the humidifier needs to draw heated air across the pad in order to maximize the humidification output. Mounting the HE360 Powered Flow Through Humidifier on the return side will greatly reduce its efficiency. If space restrictions prevent installation on the warm air supply, consider using the HE260 Bypass Flow Through Humidifier instead.