Under 40 CFR 82.154(a), which refrigerant in a household refrigerator is exempt from the venting prohibition?
Recovery requirements · EPA 608 Type I. The correct answer, and the reasoning behind it.
The small-appliance definition and the recovery levels required.
The question
Under 40 CFR 82.154(a), which refrigerant in a household refrigerator is exempt from the venting prohibition?
- R-134a
- R-12
- Isobutane (R-600a)Correct answer
- R-22
Why “Isobutane (R-600a)” is correct
Section 82.154(a)(1) exempts isobutane (R-600a) in household refrigerators, freezers and combination units from the venting prohibition and the rest of Subpart F. R-12, R-22 and R-134a in the same appliance must be recovered.
Source: 40 CFR 82.154(a)
Why the other answers are wrong
- R-134a — R-134a is a non-exempt HFC substitute, so venting it is prohibited.
- R-12 — R-12 is a CFC; venting it has always been prohibited.
- R-22 — R-22 is an HCFC and may not be vented.
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