Executive Summary
This paper explains important considerations that help weatherization professionals and HVAC contractors identify the best product for their duct airtightness testing needs. It also describes differences between various styles of fans that are used for performance testing of forced air distribution systems in both houses and light commercial buildings. Airtightness measurements of ducts are used to diagnose and demonstrate leakage problems, estimate efficiency losses from duct leakage, and certify code compliance with duct leakage standards such as IECC 2012 and 2015 and California’s Title 24 Building Energy Efficiency Standards.


1. Fan Styles
2. Why do Fan Styles Matter?
3. Different Fans are designed for Different Purposes
4. Duct Blaster Use and Misuse

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