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California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-10-23 · 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) · Effective January 1, 2026 · Official source: Building Standards Commission
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LABELED
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0
LABELS AND INSTRUCTIONS
For appliances. . . . . . . . . . . . . . . . . . . . . . . . . . . . 307.0
For heating appliances . . . . . . . . . . . . . . . . . . . . . 307.0
For hydronic systems . . . . . . . . . . . . . . . . . . . . . 1204.0
For refrigerating systems . . . . . . . . . . . . . . . . . . . 1115.0
For type I hoods. . . . . . . . . . . . . . . . . . . . . . . . . 508.5.3
LABORATORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 410.0
LADDER, PERMANENT . . . . . . . . . . . . . . . . . . . . 304.3.1.2
LEAKS
Fuel gas . . . . . . . . . . . . . . . . . . . . . . . . . 1313.4, 1313.5
LINE CONTACT INSTALLATION
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0
LIQUEFIED PETROLEUM GAS (LP-GAS)
Appliances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303.7.1
Automatic control devices . . . . . . . . . . . . . . . . . . . 306.0
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209.0
Gas Facilities . . . . . . . . . . . . . . . . 214.0, 303.7, 1312.11
Shutoff devices. . . . . . . . . . . . . . . . . . . . . . . . . . D 110.4
Supply connections . . . . . . . . . . . . . . . D 101.2, D 106.1
LIQUID-FUELED ENGINES AND GAS TURBINES . . . . 1602.2
LISTED
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0
LISTED AND LISTING
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0
LISTING AGENCY
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0
LOCATION OF
Appliances in garages . . . . . . . . 305.1.1, 305.1.2, 905.8
Appliances subject to
mechanical damage . . . . . . . . . . . . . . . . . . . . 305.1.1
Boilers, central heating . . . . . . . . . . . . . . . . . . . . . 904.2
Draft hoods and controls . . . . . . . . . . . . . 802.12, 905.5
Evaporative cooling systems. . . . . . . . . . . . . . . . . 932.2
Pool heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 926.2
Refrigerating equipment . . . . . . . . . . . . . . . . . . . 1106.1
Wall furnaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 907.3
LOUVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 315.0
LOUVERS, GRILLES,
AND SCREENS . . . . . . . . . . . . . . . . . . . . . . . . . . . 701.10
LOW-PRESSURE
HOT-WATER-HEATING BOILER
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0
LOW-PRESSURE STEAM-HEATING BOILER
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0
LOW-WATER CUTOFF . . . . . . . . . . . . . . . . . . . . . . . 1008.0
LOWER FLAMMABILITY LIMIT (LFL)
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214.0
Product conveying ducts . . . . . . . . . . . . . . 505.1, 505.3
Refrigeration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1104.4
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