### Question
How does PROGRAMS AND ACTIVITIES define refrigerant?


### Answer
Under *42 U.S.C. § 7671d*, **refrigerant** is defined as:

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

#### Citation:
  - *42 U.S.C. § 7671d*
  - Heading: **SUBCHAPTER I-PROGRAMS AND ACTIVITIES > Subchapter Referred to in Other Sections**

