### Question
What does refrigerant mean?


### Answer
**Refrigerant** has the following meaning in *42 U.S.C. § 7671d*:

> any class II substance used for heat transfer in a refrigerating system

#### Citation:
  - *42 U.S.C. § 7671d*
  - Heading: **CHAPTER 85-AIR POLLUTION PREVENTION AND CONTROL > SUBCHAPTER VI-STRATOSPHERIC OZONE PROTECTION**

