This standard covers gas fired refrigerators, having refrigerated spaces for storage of foods with input ratings of 1000 Btu per hour (293 W) or less, and which are for use with HD 5 propane gas only. These refrigerators are intended for use both indoors
ANSI Z21.74-1992 history
1992ANSI Z21.74-1992 Portable Refrigerators for Use with HD-5 Propane Gas