Environmental Protection Agency (EPA) MVAC Certification

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Get ready for the EPA MVAC Certification exam with our study materials covering flashcards and multiple choice questions, each offering hints and explanations. Prepare thoroughly for your certification!

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Which refrigerants are known for having a high ozone-depletion potential?

HCFCs
HFCs
CFCs
HFOs

The correct answer is: CFCs

CFCs, or chlorofluorocarbons, are known for having a high ozone-depletion potential. This is primarily due to their composition, which includes chlorine atoms. When CFCs are released into the atmosphere, they eventually reach the stratosphere, where UV radiation causes the molecules to break down and release chlorine. A single chlorine atom can destroy thousands of ozone molecules, contributing significantly to the depletion of the ozone layer. The concern about ozone depletion led to international agreements, such as the Montreal Protocol, aimed at phasing out the production and use of CFCs. The alternatives to CFCs, such as HCFCs, HFCs, and HFOs, are designed to have lower or no ozone depletion potential. HCFCs, for example, have a lower potential compared to CFCs but are still being phased out due to their impact on ozone. HFCs do not contain chlorine and therefore do not deplete the ozone layer, while HFOs are designed to be environmentally friendly and are even less harmful to both the ozone layer and global warming potential.