[Bldg-sim] A90.1 climate zone letter

[farmerp at boltblue.com]

Hello,

For international locations A90.1 states:

5.1.4.2 International Locations. For locations in Canada that are listed in Table B-2
in Appendix B, use this table to determine the required climate zone number and, when
a climate zone letter is also required, use Table B-4 and the Major Climate Type
Definitions in Appendix B to determine the letter (A, B, or C). For locations in
other international countries that are listed in Table B-3, use this table to
determine the required climate zone number and, when a climate zone letter is also
required, use Table B-4 and the Major Climate Type Definitions in Appendix B to
determine the letter (A, B, or C). For all international locations that are not
listed either in Table B-2 or B-3, use Table B-4 and the Major Climate Type
Definitions in Appendix B to determine both the climate zone letter and number.

With the emphasis on the statement "when a climate zone letter is also required,
...", does anybody know what triggers the requirement for a climate zone letter? I've
found one international location to yield different zones via table B-3 and B-4. What
do I do in this situation?

Best regards

Chris

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