1103.3 Higher Flammability Refrigerants — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Mechanical Code (Title 24, Part 4) § 1103.3 · Effective January 1, 2026 · Official source: Building Standards Commission
Group A3 and B3 refrigerants shall not be used except where approved by the Authority Having Jurisdiction.
Exceptions:
(1) Laboratories with more than 100 square feet (9.29 m [2] ) of space per person.
(2) Industrial occupancies.
(3) Listed self-contained systems containing not more than 0.331 pounds (0.150 kg) of Group A3 refrigerant, provided that the equipment is installed in accordance with the listing and the manufacturer’s installation instructions. [ASHRAE 15:7.5.3]
Get a plain-English answer with a citation back to this text.
Ask AI about this code