EPA 608 Core · Section 608 Regulations · Hard
Is it legal to vent natural refrigerants like R-290 (propane) or R-744 (CO2)?
Answer: A. Only in the end-uses where EPA exempts them.
- AOnly in the end-uses where EPA exempts them.✓ Correct
- BNo, venting any refrigerant is strictly illegal.
- CYes, but only from systems holding under 5 lbs.
- DNo, they must be recovered to a deep vacuum.
Why A is right
CO2 is exempt from the venting prohibition in every application, but hydrocarbons are exempt only in specific end-uses, such as isobutane in household refrigerators or propane in stand-alone retail food refrigerators. Anywhere else, venting them is illegal.
More Core questions
- What EPA certification is required to purchase HCFC or HFC refrigerants?
- When does an EPA Section 608 Technician Certification expire?
- How long must records be kept for appliance disposal (5-50 lbs charge)?
- What happens if a technician vents an HFC refrigerant like R-410A?
- What does the AIM Act authorize the EPA to do regarding HFCs?
Go deeper with the study guide How to Get EPA 608 Certified in 2026: Step by Step, 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.