Index — G
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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GALVANIZED STEEL
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209.0
GAS CONVENIENCE OUTLET . . . . . . . . . . . . . . . . . 1312.8
GAS ENGINE, STATIONARY . . . . . . . . . . . . . . . . . . 1602.0
GAS ENGINES,
AIR CONDITIONERS . . . . . . . . . . . . . . . . . . . . . . 903.2.3
GAS VENT CONNECTOR . . . . . . . . . . . . . (see Connectors,
gas vent)
GAS VENT,
SURROUNDING SPACE . . . . . . . . . . . . . . . . . . . 802.5.11
GAS-FIRED
Air conditioners
and heat pumps . . . . . . . . . . . . . . . . . . . . . . . . 903.2
Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 903.2.1
Clothes dryers. . . . . . . . . . . . . . . . . . . . . . . . . . . . 908.3
Household cooking appliances . . . . . . . . . . . . . . . 919.3
Industrial air heaters . . . . . . . . . . . . . . . . . . . . . . . 914.0
Packaged terminal . . . . . . . . . . . . . . . . . . . . . . . . 903.3
Room heaters . . . . . . . . . . . . . . . . . . . . . . . . . . . . 915.3
Toilets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 928.0
GAS FIREPLACE, VENTED . . . . . . . . . . . . . . . . . . . . 912.0
GAS TURBINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1602.2
GASEOUS HYDROGEN SYSTEMS . . . . . . . . . . . . . . 936.0
GAUGES, STEAM BOILERS . . . . . . . . . . . . . . . . . . 1003.3
GENERATORS
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209.0
Emergency Diesel-Powered . . . . . . . . . . . . . . . . . 324.0
Engine. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1602.0
Steam. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 917.2, 1011.0
GEOTHERMAL ENERGY SYSTEMS . . . . . . . . . Chapter 17
Ambient Temperature Loops . . . . . . Chapter 17 (Part V)
Closed-loop systems . . . . . . . . . . . . Chapter 17 (Part II)
Decommissioning and abandonment . . . . . . . . . 1709.0
Design of systems. . . . . . . . . . . . . . . . . . . . . . . . 1703.0
Direct exchange systems . . . . . . . . Chapter 17 (Part IV)
General . . . . . . . . . . . . . . . . . . . . . . Chapter 17 (Part I)
Groundwater systems . . . . . . . . . . . . . . . . . . . . . 1702.0
Heat pumps. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1704.0
Heat transfer fluid. . . . . . . . . . . . . . . . . . . . . . . . 1701.11
Installation practices . . . . . . . . . . . . . . . . . . . . . . 1707.0
Open-loop systems. . . . . . . . . . . . . Chapter 17 (Part III)
Specific system components design . . . . . . . . . . 1706.0
System start-up. . . . . . . . . . . . . . . . . . . . . . . . . . 1708.0
Valves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1705.0
GRAVITY
Definition, heating system. . . . . . . . . . . . . . . . . . . 209.0
Type floor furnace. . . . . . . . 209.0, 306.1, Table 904.3.2
Venting system. . . . . . . . . . . . . . . 224.0, 930.5.3, 930.6
GREASE
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209.0
Ducts . . . . . . . . . . . . . . . . . . . . . 209.0, 510.1.3, 510.1.7
Ducts, four stories or more . . . . . . . . . . . . . . . . . 517.4.2
Drip trays. . . . . . . . . . . . . . . . . . . . . . 509.2.4, 509.2.4.1
Filter mesh type, definition . . . . . . . . . . . . . . . . . . 209.0
Filters . . . . . . . . . . . . . 209.0, 509.1, 509.2.3, 509.2.3.4,
509.2.4, 509.2.5, 516.3.2
Laden vapors. . . . . . . . . . . . . . . . 507.2, 508.3.1, 508.5,
511.2.2, 511.4.6,
513.1.2, 516.1
Receptacle. . . . . . . . . . . . . . . . . . . . 511.1.2.1, 511.1.3.1,
511.1.3.2
Removal devices . . . . . . . . . . . . . . 209.0, 507.4, 509.0,
513.1, 513.2.5,
516.1, 517.5
Vapors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.3.1
GRILLES AND LOUVERS . . . . . . . . . . . . . . . . . . . . . 701.10
GROUNDING ELECTRODE . . . . . . . . . . . . . . 209.0, 1311.0
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