N.M. Admin. Code § 14.9.6.12 - CHAPTER 4 PIPING
See this chapter of the USEC except as follows: 402.1.8 Freeze protection. See this section of the USEC except delete the first sentence and substitute with the following: No solar thermal piping containing heat transfer fluid that is capable of freezing under normal conditions shall be installed or permitted outside of a building or in an exterior wall, unless, where necessary, adequate provisions is made to protect such pipe from freezing.
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