Which of the following does the CSA-B52 standard NOT apply to?

The CSA-B52 standard specifically addresses refrigeration systems and provides guidelines for the design, operation, and maintenance of various refrigeration equipment and systems. The standard covers a broad range of refrigeration applications, including chillers and refrigeration systems used in commercial and industrial settings.

When considering the elements in the question, air is not classified under the same category as refrigerated transport vehicles, chillers, and refrigeration systems. The primary focus of the CSA-B52 standard is on refrigerants and their use in various applications rather than air as a medium itself. While air can be involved in certain heat exchange processes, it does not fall directly under the purview of CSA-B52 when it comes to regulations regarding the operation and safety of refrigeration systems.

Thus, the correct answer reflects that the CSA-B52 standard does not apply specifically to air, which is not subject to the same regulations or standards that govern refrigerated transport vehicles, chillers, or refrigeration systems.