R-134a is non-toxic and non-flammable. Which of the following groups does it belong to? Power Engineering Chapter 114 R-134a is non-toxic and non-flammable. Which of the following groups does it belong to? a. Group A2 b. Group B4 c. Group A1 d. Group A3 e. Group B2 Answer: C Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+