MACS 609 Certification Practice Exam

How has the U.S. EPA classified HFO-1234yf?

1. Experimental and under review

2. Acceptable, but only for domestic use

3. Acceptable, subject to use conditions

4. Prohibited for general use

The correct answer is: Acceptable, subject to use conditions

The U.S. EPA has classified HFO-1234yf as "acceptable, subject to use conditions." This classification indicates that while HFO-1234yf is recognized as a viable option for certain applications, particularly in refrigeration and air conditioning, it comes with specific guidelines and restrictions to ensure safety and environmental compliance. These conditions are often related to its focus on reducing greenhouse gas emissions compared to traditional refrigerants, aligning with National and international efforts to phase down high Global Warming Potential (GWP) substances. By categorizing it in this manner, the EPA is promoting the use of HFO-1234yf while maintaining oversight on its application to mitigate potential risks associated with its use. This reflects a balanced approach to encourage innovation in refrigerant technology while ensuring environmental protection.