Index — I
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
– I –
IDLH
Definition,. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211.0
Refrigeration . . . . . . . . . . . . . . . . 1106.2.5, 1106.11.10.3
INCINERATORS
Commercial and
industrial type . . . . . . . . . . . . . . . . . . . . . . . . . . 924.0
Fume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208.0, 512.3
Residential . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 924.3
INDOOR HORTICULTURAL FACILITIES . . . . . . Appendix I
Carbon dioxide detection systems . . . . . . . . . . . . I 601.0
Chemical storage. . . . . . . . . . . . . . . . . . . . . . . . I 1301.0
Classifications . . . . . . . . . . . . . . . . . . . . . . . . . . . I 301.0
Ducts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I 1001.0
Fire protection . . . . . . . . . . . . . . . . . . . . . . . . . . . I 501.0
Flammable solvents. . . . . . . . . . . . . . . . . . . . . . . I 701.0
Fumigation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I 1601.0
Particulate and odor control. . . . . . . . . . . . . . . . . I 901.0
Ventilation and exhaust system . . . . . . . . . . . . . . I 801.0
INDUSTRIAL HEATING EQUIPMENT
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211.0
INSANITARY LOCATION
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211.0
INSPECTIONS
Chimneys. . . . . . . . . . . . . . . . . . . . . . . 802.5.6, 802.5.7
Commercial kitchen
exhaust system, schedule of . . . . . . . . . . Table 514.3
Evaporative cooler . . . . . . . . . . . . . . . . . . . . . . . . 932.3
Fire-extinguishing equipment . . . . . . . . . . . . . . . . 514.2 Fuel gas piping . . . . . . . . . . . . . 1303.0, 1304.0, 1313.1
Reinspections . . . . . . . . . . . . . . . . . . . . . . . . . . 105.2.6
Requests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105.2.3
INSTALLATIONS OF
Appliances in manufactured housing . . . . . . . . . . 929.0 Appliances in garages. . . . . . . . . . . . . . . . . . . . . . 305.1 Appliances in repair garages . . . . . . . . . . . . . . 303.11.2
Ducts. . . . . . . . . . . . . . . . . . . . . . . . . . . . 510.5.3, 603.0
Equipment and appliances . . . . . . . . . . . . . . . . . . 303.0 Gas piping . . . . . . . . . . . . . . . . . . . . . . . 1310.0, 1310.3,
1310.10, 1312.10
Overhead heaters in commercial
garages and aircraft hangars . . . . . . . . . 905.8, 925.5
INSULATION OF
Ducts . . . . . . . . . . . . . . . . . . . 506.11.2, 506.11.3, 605.0,
E 502.4.1, E 503.4.7,
Table E 503.7.2,
Hoods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508.3.4
Hydronic systems. . . . . . . . . . . . . . . . . 1201.2, 1220.4.7,
1217.8.2, 1217.8
HVAC system piping. . . . . . . . . . E 502.5, E 503.4.7.1.2,
Table E 502.5,
Table E 503.7.3(1)
INTERLOCK
Air heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 914.7
Cooking equipment
ventilation . . . . . . . . . . . . . . . . . . . . . . 517.1.3, 517.6.2
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211.0
Exhaust. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503.1
Gas mixing machines. . . . . . . . . . . . . . . . . . . 1310.14.5
Inspection of safety . . . . . . . . . . . . . . . . . . . . . . 516.6.4
Mechanical air supply . . . . . . . . . . . . . . . . . . . . . 701.9.2
Motorized louvers . . . . . . . . . . . . . . . . . . . . . . . 701.10.2
Recirculating systems . . . . . . . . . . . . . . . . . . . . . . 516.3 Stack dampers . . . . . . . . . . . . . . . . . . . . . . . . . . 1003.4
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