Passive Returns—A Study in Ten Homes

Winter 2016
This online-only article is a supplement to the Winter 2016 print edition of Home Energy Magazine.
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October 06, 2016
Anyone who has been in the building science industry for more than a month probably knows what room pressure tests are, and why we would bother to run them. Back in early 2012, when I taught at the Southwest Building Science Training Center in Phoenix, Arizona, I had no problem explaining the concept of room pressure issues, and the negative impact they have on a home, HVAC equipment, and human comfort. I could use my digital manometer, smoke stick, and infrared camera to demonstrate and measure the problems we see in a home with a centralized return duct system and interior doors. And if you have ever performed a combustion appliance zone (CAZ) test, you know an even more important reason why we measure such things.

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