I just bought a model 600 Aprilaire humidifier and wanted to know which install is better.
Putting the humidifier on the supply or return side and why??
One of the advantages of a bypass humidifier is that it can be installed either on the supply plenum or on the return duct with equal effectiveness. No matter which duct the unit is mounted on, the airflow always goes from the supply to the return through the humidifier.
A bypass humidifier will also have no adverse effect on any component in the furnace, air cleaner or filter. Aprilaire® Humidifiers put water vapor into the air, not raw water. This is nature’s way of getting relative humidity into the air.
If you have any further questions regarding this or any of our products, please feel free to contact our customer service department at your earliest convenience.
Customer Service Specialist
Aprilaire – Division of Research Products Corporation
1-800-334-6011 ext 6180
Call center hours are M-F 7am-5pm CST