EPA 608 Core · Substitute Refrigerants & Oils · Hard
Which refrigerant is approved as an exempt substitute for new household fridges?
Answer: C. Isobutane (R-600a)
- AR-410A (an HFC blend)
- BR-12 (a CFC)
- CIsobutane (R-600a)✓ Correct
- DR-22 (an HCFC)
Why C is right
Isobutane (R-600a) is an exempt hydrocarbon approved for new household refrigerators.
More Core questions
- Which type of oil is most commonly used with HFC refrigerants?
- Which oil is primarily used in automotive HFC-134a AC systems?
- Which oil was historically the standard for CFC refrigerants?
- What does 'hygroscopic' mean regarding refrigeration oils?
- Can mineral oil be used to retrofit a CFC system to an HFC refrigerant?
Go deeper with the study guide A2L Refrigerants and the R-410A Transition: A Tech’s Guide, try the free 10-question test or browse all EPA 608 practice questions.
A practice question written for study, checked against 40 CFR Part 82, Subpart F. It is not an official EPA exam question, and this site is not affiliated with the U.S. EPA.