Which refrigerants have minimum or zero ozone depletion potential?

The choice indicating HFCs reflects current knowledge about the environmental impact of refrigerants, particularly regarding ozone depletion potential. Hydrofluorocarbons (HFCs) are synthetic compounds that have been developed as replacements for older refrigerants that are known to deplete the ozone layer, such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs).

HFCs do not contain chlorine or bromine, which are the elements responsible for ozone layer damage in CFCs and halons. This absence of ozone-depleting compounds is critical in assessing their environmental impact. Therefore, HFCs are classified as having a minimum or zero ozone depletion potential, making them a more environmentally friendly option compared to CFCs, HCFCs, and halons.

CFCs are highly regulated due to their significant ozone depletion potential, while HCFCs, although less damaging than CFCs, still have some ozone-depleting properties. Halons are also harmful to the ozone layer and are primarily used in fire suppression. This makes HFCs the most suitable choice when considering refrigerants that do not contribute to ozone depletion.