(a) The following definitions refer to commercial hot food holding cabinets:

1. (1) Commercial hot food holding cabinet means a heated, fully enclosed compartment, with one or more solid or partial glass doors, that is designed to maintain the temperature of hot food that has been cooked in a separate appliance.

   1. (i) Commercial hot food holding cabinet does not include heated glass merchandising cabinets, drawer warmers or cook-and-hold appliances.
2. (2) Idle energy rate–dry means the rate of appliance energy consumption while it is maintaining or holding at the control set point, without using a humidity-generating device (if applicable).
3. (3) Drawer warmer means an appliance that consists of one or more heated drawers and that is designed to hold hot food that has been cooked in a separate appliance at a specified temperature.
4. (4) Heated transparent merchandising cabinets means an appliance with a heated compartment that is designed to display and maintain the temperature of hot food that has been cooked in a separate appliance.
5. (5) Cook-and-hold appliance means a multiple-mode appliance intended for cooking food that may be used to hold the temperature of the food that has been cooked in the same appliance.
6. (6) Proofing cabinet means an enclosed mobile, portable, or stationary appliance designed to maintain the proper temperature and relative humidity for supporting fermentation of dough products by yeast.

7. (7) Product family means models built based on the same basic engineering design with the same interior cabinet volume. Units within the family may differ in regard to energy consumption as long as cabinet size remains constant. Qualification of the product family shall be based on a representative model, as defined in subdivision (c) of this section.

   (b) Standard requirements for commercial hot food holding cabinets, as is consistent with the efficiency levels established by ENERGY STAR V. 2.0 specification for Commercial Hot Food Holding Cabinets, as incorporated by reference in section 509.61 of this Part.

8. (1) Measuring cabinet interior volume: commercial hot food holding cabinet interior volume shall be calculated using straight-line segments following the gross interior dimensions of the appliance and using Equation 1 below. Interior volume shall not account for racks, air plenums or other interior parts. ​Image 1 within document in PDF format.​

   ​Image 1 within document in PDF format.​

9. (2) Maximum idle energy rate requirements: Table 10: Requirements for Maximum Idle Energy Rate Note: V = Interior volume in cubic feet (ft³)

   Product Interior Volume (Cubic Feet)	Product Idle Energy Consumption Rate (Watts)
   0 < V < 13	≤ 21.5 V
   13 ≤ V < 28	≤ 2.0 V + 254.0
   28 ≤ V	≤ 3.8 V + 203.5

10. (3) Significant digits and rounding:

    1. (I) All calculations shall be carried out with actual measured or observed values. Only the final result of a calculation shall be rounded. Calculated results shall be rounded to the tenth decimal point.

    2. (II) Unless otherwise specified, compliance with specification limit shall be evaluated using exact values without any benefit from rounding.

       (c) Test procedures for assuring compliance with the standards established in subdivision (b) of this section.

11. (1) Representative models shall be selected for testing per the following requirements:

    1. (i) For qualification of an individual product model, the representative model shall be equivalent to that which is intended to be marketed and labeled as ENERGY STAR.
    2. (ii) For qualification of a product family, the most energy consumptive unit within the product family (defined in section 1) shall serve as the representative model.

12. (2) When testing commercial hot food holding cabinets, the following test methods shall be used: Table 11: Test Method for Commercial Hot Food Holding Cabinets

    Requirement	Test Method Reference
    Idle Energy Rate	ASTM Standard F2140-11, Test Method for the Performance of Hot Food Holding Cabinets, as incorporated by reference in section 509.61 of this Part