![]() ![]() How is it different?How is it different?How is it different? It is also the commercial energy reference in NFPAs family of codes. It is the reference standard for Chapter 7 of the 2001 IECC. It replaces ANSI/ASHRAE/IESNA Standard 90.1-1989 and the codified version of Standard 90.1-1989 (the gray book). Why is Standard 90.1-1999 important?Why is Standard 90.1Why is Standard 90.1-1999 important?1999 important? Department of Energy Building Energy Codes ProgramBuilding Energy Codes Program
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