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 of the following refrigerants is not banned but is regulated?

R-12
R-134A
R-22
R-404A

The correct answer is: R-134A

R-134A is a refrigerant that is not banned but is regulated due to its impact on the environment, specifically concerning its global warming potential. It is a hydrofluorocarbon (HFC) that was introduced as a replacement for R-12, which is a chlorofluorocarbon (CFC) that has been banned due to significant ozone depletion potential. While R-134A is considered to have less damaging effects on the ozone layer, it still contributes to greenhouse gas emissions, which has prompted regulatory measures to manage its use. This includes restrictions on its production and sale, aiming to encourage the transition towards more environmentally friendly refrigerants. Other refrigerants listed have varying degrees of regulation and bans; for example, R-12 and R-22 are being phased out due to their ozone-depleting properties, while R-404A has high global warming potential and is facing increasing regulatory pressure. Thus, R-134A stands out as a refrigerant that remains commercially available but under strict regulatory frameworks to mitigate its environmental impact.