Refrigerants CFC-12, HCFC-22, and HFC-134a are all classified as Type _______ substances?

CFC-12, HCFC-22, and HFC-134a are all classified as Type A substances because they are relatively low in toxicity when considering their potential effects on human health. The classification system used by the EPA categorizes substances based on their toxicity levels and flammability, with Type A substances being less hazardous.

Type A refrigerants can be handled with appropriate safety precautions, such as using personal protective equipment and ensuring adequate ventilation, but they do not require as stringent controls as more toxic or flammable substances. This classification is important for technicians working with these refrigerants, as it guides handling and safety practices during installation, servicing, and disposal.

In contrast, other classifications, such as Type B, designate substances with more significant health hazards or flammability concerns, which require stricter adherence to safety protocols.