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APPENDIX B
FIGURE B-19 This map is a necessarily generalized guide to temperatures in the contiguous United States. Temperatures shown for areas such as mountainous regions and large urban centers are not necessarily accurate. The climate data used to develop this map are from the ASHRAE Handbook—Fundamentals (Climate Conditions for the United States).
NFGC: 99% Winter Design Temperatures for the Contiguous United States For 99% winter design temperature in Alaska, consult the ASHRAE Handbook—Fundamentals. 99% winter design temperatures for Hawaii are greater than 37 o F.
2018 INTERNATIONAL FUEL GAS CODE ® 161
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