A188.8.131.52 Air Distribution System Duct Leakage Sealing
Has more than 25 percent duct surface area located in one or more of the following spaces:
- Outdoors; or
- In a space directly under a roof with fixed vents or openings to the outside or unconditioned spaces; or
- In an unconditioned crawlspace; or
- In other unconditioned spaces.
The leakage rate shall be confirmed through field verification and diagnostic testing, in accordance with procedures set forth in the Reference Nonresidential Appendix NA1 of the California Energy Commission 2008 Building Energy Efficiency Standards for Residential and Nonresidential Buildings.