Substitute
Substitute means any chemical or product, whether existing or new, that is used as a refrigerant to replace a class I or II ozone-depleting substance. Examples include, but are not limited to hydrofluorocarbons, perfluorocarbons, hydrofluoroolefins, hydrofluoroethers, hydrocarbons, ammonia, carbon dioxide, and blends thereof. As used in this subpart, the term exempt substitutes refers to certain substitutes when used in certain end-uses that are specified in 82.154(1) as exempt from the venting prohibition and the requirements of this subpart, and the term non-exempt substitutes refers to all other substitutes and end-uses not so specified in 82.154(a)(1).