Sale of which of the following refrigerants is not limited to technicians?

The sale of HFCs (Hydrofluorocarbons) is not limited to technicians because, unlike CFCs (Chlorofluorocarbons) and HCFCs (Hydrochlorofluorocarbons), HFCs do not pose the same level of threat to the ozone layer. The regulations governing HFCs are less stringent compared to those governing the sale and handling of refrigerants that can deplete the ozone layer. As a result, individuals and businesses that are not certified technicians can purchase HFCs without the restrictions that apply to CFCs and HCFCs.

In contrast, CFCs and HCFCs are subject to significant regulations under the EPA due to their ozone-depleting properties. The sale and handling of these refrigerants require certification to ensure that technicians are trained to manage them responsibly and minimize environmental impact. This distinction is crucial for compliance with environmental laws and for protecting the atmosphere.