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ASHRAE Guideline 0-2019
The Commissioning Process
Describes a Commissioning Process (Cx) capable of verifying that the facility and its systems meet the Owner’s Project Requirements (OPR). The procedures, methods, and documentation requirements in this guideline describe each phase of the project delivery and the associated Commissioning Processes from predesign through occupancy and operation, without regard to specific elements, assemblies, or systems. Dual units of measurement.
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ashrae]