This chapter shall apply to any equipment or mechanical, electrical, or thermal component of a system designed to heat, cool, or otherwise condition air, but, with that exception, shall not apply to the system as a whole where such a system becomes a fixed part of a structure.
Source:
Section 1795.1, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=CIV§ionNum=1795.1..