This standard applies to the following types of open and closed commercial refrigerators and freezers used for displaying or holding products for which refrigeration is either required or desired: a. Horizontal@ semivertical@ and vertical open and closed refrigerators and freezers b. Both remote and self-contained open and closed refrigerators and freezers This standard does not apply to walk-in coolers or refrigerators and freezers where the refrigerated air is in communication with walk-in coolers. PURPOSE The purpose of this standard is to prescribe a uniform method of testing open and closed refrigerators and freezers for rating so that comparative evaluations can be made of energy consumption@ product temperature performance@ refrigeration load@ the suction pressures required@ and other performance factors.