# Protection of Stratospheric Ozone: Amendment to HFO-1234yf SNAP Rule for Motor Vehicle Air Conditioning Sector
> **Rule** · Direct final rule. · Published 2012-03-26 · Effective 2012-05-21 · 77 FR 17344
## Document
- **Document number:** 2012-6916
- **Category:** air-emissions
- **Federal Register citation:** 77 FR 17344
- **CFR reference:** 40 CFR 82
- **Publication date:** 2012-03-26
- **Effective date:** 2012-05-21
- **EPA docket:** EPA-HQ-OAR-2011-0776
## Abstract

The U.S. Environmental Protection Agency (EPA) is taking direct final action to revise one of the use conditions required for use of hydrofluoroolefin (HFO)-1234yf (2,3,3,3-tetrafluoroprop-1-ene), a substitute for ozone-depleting substances (ODSs) in the motor vehicle air conditioning end-use within the refrigeration and air conditioning sector, to be acceptable subject to use conditions under EPA's Significant New Alternatives Policy (SNAP) program. The revised use condition incorporates by reference a revised standard from SAE International.

## Source
- [Federal Register document](https://www.federalregister.gov/documents/2012/03/26/2012-6916/protection-of-stratospheric-ozone-amendment-to-hfo-1234yf-snap-rule-for-motor-vehicle-air)
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