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REGULATORY FILING

EPA SNAP Rule 21 - Unacceptability of Flammable Refrigerants as Retrofits

Source U.S. Environmental Protection Agency
Published 2015-07-20
Type regulatory filing
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

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EPA SNAP Rule 21 - Unacceptability of Flammable Refrigerants as Retrofits
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.

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