3135B Gas Chlorination Equipment Room — 2025 California Building Code
California Building Code (Title 24, Part 2) · 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 Building Code (Title 24, Part 2) § 3135B · Effective January 1, 2026 · Official source: Building Standards Commission
Compressed chlorine gas storage containers and auxiliary components shall be installed indoors in a separate room of not less than 1- hour fire resistant construction and shall comply with the California Fire Code and all of the following.
3135B.1 Location.¶
The gas chlorination equipment room shall not be located in any habitable building, above the first floor or below ground level.
3135B.2. Exit. Required exit doors shall swing in the direction of exit of travel and shall not open directly toward the pool or pool deck.
3135B.3 Ventilation.¶
Mechanical exhaust ventilation systems shall be in compliance with the California Mechanical Code.
3135B.4 Alarm.¶
An audible and visible chlorine detection alarm system shall be located in the room containing the gas chlorine equip- ment. The sensor shall be located within 6 inches (152 mm) of the floor level. The system shall continually monitor the room and shall activate when chlorine concentrations in the room exceed a Permissible Exposure Limit of 0.5 ppm. Activation of the alarm shall shut off the chlorine at the source and turn on the lights and ventilation system. The alarm system shall consist of the following:
1. An audible alarm capable of producing a sound level of at least 90 decibels; and
2. A visible alarm consisting of a strobe light which is mounted directly over the entrance to the chlorine equipment room. The light shall be visible during daylight hours.
3135B.5 Illumination.¶
Artificial illumination of at least 50 footcandles as measured 30 inches (750 mm) from the floor shall be provided in the room.
3135B.6 Switches.¶
Switches for the control of mechanical ventilation and lighting fixtures shall be located adjacent to the entry door outside the room.
3135B.7 Equipment interlocks.¶
The gas chlorine feeding device shall be interlocked with the pool recirculating pump so that the gas chlorine feeding device shall not operate when the recirculating pump is off or during the filter backwash.
3135B.8 Storage.¶
The gas chlorine room shall not be used for the storage of items not related to the use of the gas chlorine equipment.
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