ASHRAE Standard 72 prescribes a uniform method of testing open and closed refrigerators and freezers for rating. The standard applies to horizontal, semivertical, and vertical open and closed refrigerators and freezers, and to both remote and self-contained open and closed refrigerators and freezers.The revised 2018 edition of Standard 72 adds energy management devices and drawer openings for refrigerator and freezer units with drawers. It also clarifies door and drawer opening methods, test probe locations for units over 1220 mm (4 ft) in width, electrical loads that need to be on during the test, air current measurements within the test room,and the measurement of internal volumes.