Self-contained or active recovery equipment;

Service technicians who violate Clean Air Act provisions:

Blended refrigerants leak from a system:

Which of the following is an example of an HCFC refrigerant?

Production of CFC refrigerants became illegal on January 1, ____________________.

Cooling occurs in a direct- expansion vapor compression refrigeration system when:

When a technician works for a company in which the technician does not have a financial interest, the technician does not have to be certified.

The small amount of refrigerant released when removing gauge hoses from the system is called ____________________.

Refrigerants that damage the ozone layer contain an element called ____________________.

Why is stratospheric ozone so important to our environment?