1104.1 System Selection — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-10-19 · 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) § 1104.1 · Effective January 1, 2026 · Official source: Building Standards Commission
Refrigeration systems shall be limited in application in accordance with Table 1104.1, and the requirements of Section 1104.0. TABLE 1104.1 PERMISSIBLE REFRIGERATION SYSTEMS [1 ]
| OCCUPANCY GROUP3 | HIGH-PROBABILITY SYSTEM | LOW PROBABILITY SYSTEM | MACHINERY ROOM |
|---|---|---|---|
| A-1 | Group A1 or A2L4 only | Any | Any |
| A-2 | Group A1 or A2L4 only | Any | Any |
| A-3 | Group A1 or A2L4 only | Any | Any |
| A-4 | Group A1 or A2L4 only | Any | Any |
| B | Group A12 or A2L2,4 only | Any | Any |
| E | Group A1 or A2L4 only | Any | Any |
| F-1 | Group A12 or A2L2,4 only | Any | Any |
| F-2 | Any2 | Any | Any |
| H-1 | Any | Any | Any |
| H-2 | Any | Any | Any |
| H-3 | Any | Any | Any |
| H-4 | Group A1 or A2L4 only | Any | Any |
| H-5 | Group A1 or A2L4 only | Any | Any |
| I-1 | None | Any | Any |
| I-2 | Group A1 or A2L4 only | Any | Any |
| I-3 | None | Any | Any |
| I-4 | Group A1 or A2L4 only | Any | Any |
| M | Group A12 or A2L2,4 only | Any | Any |
| R-1 | Group A1 or A2L4 only | Any | Any |
| R-2 | Group A1 or A2L4 only | Any | Any |
| R-3 | Group A1 or A2L4 only | Any | Any |
| R-4 | Group A1 or A2L4 only | Any | Any |
| S-1 | Group A12 or A2L2,4 only | Any | Any |
| S-2 | Any2 | Any | Any |
| U | Any | Any | Any |
Notes: 1 See Section 1104.0. 2 A refrigerant shall be permitted to be used within a high-probability system where the room or space is in accordance with Section 1104.4. 3 Occupancy classifications are defined in the building code. 4 See Section 1104.6 for requirements applicable to A2L equipment.
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