The Benefits of Zone Pressure Diagnostics

Spring 2018
A version of this article appears in the Spring 2018 issue of Home Energy Magazine.
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March 22, 2018
Weatherization and home performance contractors have been using zone pressure diagnostic (ZPD) testing since the 1990s to better diagnose, and ultimately improve, the airtightness of homes. Though our understanding of ZPD testing has come a long way, the dynamics of ZPD testing can still be challenging or even intimidating for some field staff. Interpreting test results and knowing how to use the results are two common challenges. The good news is that if you can operate a blower door, you can conduct a ZPD test. Calculating the amount of air leakage through zones like an attic or an attached garage can involve daunting mathematics. Luckily, online tools are available to complete these calculations for us. With the right tools and a plan in place, pressure and flow readings can be collected quickly and accurately, making ZPD testing a valuable tool to facilitate high-quality retrofit upgrades.

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