Chapter 60 — HIGHLY TOXIC AND TOXIC MATERIALS
6005 Ozone-Gas Generators — 2025 California Fire Code
California Fire Code (Title 24, Part 9) · 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 Fire Code (Title 24, Part 9) § 6005 · Effective January 1, 2026 · Official source: Building Standards Commission
6005.1 Scope.¶
Ozone-gas generators having a maximum ozone-generating capacity of 0.5 pound (0.23 kg) or more over a 24-hour period shall be in accordance with Sections 6005.2 through 6005.6.
Exceptions:
- Ozone-generating equipment used in Group R-3 occupancies.
- Ozone-generating equipment where used in Group H-5 occupancies where in compliance with Chapters 27 and 50 and the other provisions in this chapter for highly toxic gases.
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HIGHLY TOXIC AND TOXIC MATERIALS
6005.2 Design.¶
Ozone-gas generators shall be designed, fabricated and tested in accordance with NEMA 250.
6005.3 Location.¶
Ozone generators shall be located in approved cabinets or ozone generator rooms in accordance with Section 6005.3.1 or 6005.3.2.
Exception: An ozone-gas generator within an approved pressure vessel where located outside of buildings.
6005.3.1 Cabinets. Ozone cabinets shall be constructed of approved materials and compatible with ozone. Cabinets shall display an approved sign stating: “OZONE-GAS GENERATOR—HIGHLY TOXIC—OXIDIZER.”
Cabinets shall be braced for seismic activity in accordance with the California Building Code .
Cabinets shall be mechanically ventilated in accordance with the California Mechanical Code with not less than six air changes per hour.
The average velocity of ventilation at makeup air openings with cabinet doors closed shall be not less than 200 feet per minute (1.02 m/s).
6005.3.2 Ozone-gas-generator rooms. Ozone-gas-generator rooms shall be mechanically ventilated in accordance with the Cali- fornia Mechanical Code with not less than six air changes per hour. Ozone-gas-generator rooms shall be equipped with a gas detection system complying with Section 916 that will shut off the generator and sound a local alarm when concentrations above the permissible exposure limit (PEL) occur.
Ozone-gas-generator rooms shall not be normally occupied, and such rooms shall be kept free of combustible and hazardous material storage. Room access doors shall display an approved sign stating: “OZONE-GAS GENERATOR—HIGHLY TOXIC— OXIDIZER.”
6005.4 Piping, valves and fittings.¶
Piping, valves, fittings and related components used to convey ozone shall be in accordance with Sections 6005.4.1 through 6005.4.3.
6005.4.1 Piping. Piping shall be welded stainless steel piping or tubing.
Exceptions:
- Double-walled piping.
- Piping, valves, fittings and related components located in exhausted enclosures.
6005.4.2 Materials. Materials shall be compatible with ozone and shall be rated for the design operating pressures.
6005.4.3 Identification. Piping shall be identified with the following: “OZONE GAS—HIGHLY TOXIC—OXIDIZER.”
6005.5 Automatic shutdown.¶
Ozone-gas generators shall be designed to shut down automatically under the following conditions:
- When the dissolved ozone concentration in the water being treated is above saturation when measured at the point where the water is exposed to the atmosphere.
- When the process using generated ozone is shut down.
- Failure of the ventilation system for the cabinet or ozone-generator room.
- Failure of the gas detection system in an ozone-gas-generator room.
6005.6 Manual shutdown.¶
Manual shutdown controls shall be provided at the generator and, where in a room, within 10 feet (3048 mm) of the main exit or exit access door.
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CALIFORNIA FIRE CODE – MATRIX ADOPTION TABLE
CHAPTER 61 – LIQUEFIED PETROLEUM GASES
(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
| Adopting Agency | BSC | BSC- CG |
SFM | HCD | DSA | OSHPD | BSCC | DPH | AGR | DWR | CEC | CA | SL | SLC | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adopting Agency | BSC | BSC- CG |
T-24 | T-19* | 1 | 2 | 1/AC | AC | SS | 1 | 1R | 2 | 3 | 4 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| Adopt Entire Chapter | X | ||||||||||||||||||||||
| Adopt Entire Chapter as amended (amended sections listed below) |
|||||||||||||||||||||||
| Adopt only those sections that are listed below |
|||||||||||||||||||||||
| [California Code of Regulations, Title 19, Division 1] |
X | ||||||||||||||||||||||
| Chapter / Section | |||||||||||||||||||||||
| [T-19 §3.22 (a)(c)] | X | ||||||||||||||||||||||
| [T-19 §3.22 (b)] | X |
- The California Code of Regulations (CCR), Title 19, Division 1 provisions that are found in the California Fire Code are a reprint from the current CCR, Title 19, Division 1 text for the code user’s convenience only. The scope, applicability and appeals procedures of CCR, Title 19, Division I remain the same. The state agency does not adopt sections identified by the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
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