Locating the unit
The humidifier installation process begins by choosing a location for the unit. The unit should be
located on the return air duct. You should ensure that there is clearance for servicing the unit.
Most units come with a template in the kit. This template is in the form of a sticker and should be
applied to the selected location. Next, a hole is cut into the return duct which allows the humidified
air to enter the duct system. It is a simple matter of cutting the metal with metal cutting snips along
the lines on the template.
Next, the unit can be mounted to the duct. This is normally done with 1 inch sheet metal screws.
**HOT TIP** FOR PROPER OPERATION THE UNIT MUST BE LEVEL WHEN INSTALLED.
If the unit is not level after installation, then the water will not be properly distributed over the
pad. This will cause the unit to waste water and possibly be unable to maintain the desired
Now, you can trace the start collar for the duct that supplies air to the unit. This should be located
on the supply plenum of the furnace. The metal should be cut out with metal snips. The collar can then
be inserted into the hole and secured by bending over the metal tabs. Now, the flexible duct can be
connected to the start collar and the inlet of the unit. It is usually secured with metal hose