What is the best practice for installing the humidifier? In the return air or the hot air plenum?

Wednesday, February 16, 2011 by Aprilaire Team
Consumer question:

What is the best practice for installing the humidifier?  In the return air or the hot air plenum?   I have an air cleaner on my furnance.  


Aprilaires' response:

Thank you for your email regarding how to install our model 600 Aprilaire® bypass humidifier.

Any bypass humidifier gets its air movement through the Water Panel® by the differential pressure between the supply (hot air) plenum and the return (cold air) duct.  The supply plenum is under positive pressure and the return duct is under negative pressure.

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.

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