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REGULATORY FILING

EPA SNAP Rule 21: Flammable Retrofits Unacceptable

Source U.S. Environmental Protection Agency
Published 2015-07-20
Type regulatory filing
Jurisdiction US Federal
Retrieved 2026-05-25

Document Summary

Rule finalizing the unacceptability of highly flammable refrigerants for retrofitting existing systems designed for non-flammable refrigerants.

Relevance to Investigation

Establishes the federal regulatory baseline that highly flammable (A3) refrigerants cannot be used as drop-in replacements in existing R-22 or R-410A systems.

Key Passages

"EPA is changing the listing status of certain refrigerants... finding them unacceptable for use as retrofits in certain end-uses."

Page 1, Summary

Subjects

  • EPA
  • SNAP
  • Rule 21
  • flammable
  • retrofit
  • prohibition

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EPA SNAP Rule 21: Flammable Retrofits Unacceptable
Source: U.S. Environmental Protection Agency | Retrieved: 2026-05-25

Related Documents

  • EPA SNAP Rule 27 - Proposed Rule (November 2025)

    EPA proposed rule (Federal Register document 2025-19812) listing HCR 4141 as acceptable for new equipment only, not for retrofit of existing R-410A or R-22 systems. A supplemental NPRM was published April 6, 2026. Rule is not finalized as of May 2026.

  • ASHRAE Standard 34: Refrigerant Safety Classifications

    ASHRAE Standard 34 (Designation and Safety Classification of Refrigerants) is the canonical industry reference for assigning refrigerants to safety groups based on toxicity and flammability. The classification combines toxicity letters (A = lower toxicity, B = higher) with flammability digits (1 = no flame propagation, 2L = lower flammability, 2 = flammability, 3 = higher flammability). Class A3 is the highest flammability tier for non-toxic refrigerants. Propane (R-290) and isobutane (R-600a) are both A3. HCR 4141 is treated as an A3-equivalent blend per EPA SNAP submissions.

  • DOJ Press Release - Enviro-Safe Refrigerants Fine

    DOJ announcement of a $300,000 civil penalty against Enviro-Safe Refrigerants for marketing unapproved flammable hydrocarbon refrigerants. The canonical source is the DOJ press release linked via externalUrl; no local PDF copy is hosted on this site.

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