Index — W
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
– W –
WALL
Furnace . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 907.0
Furnace, vented, definition . . . . . . . . . . . . . . . . . . 224.0
Heater, definition. . . . . . . . . . . . . . . . . . . . . . . . . . 225.0
Terminations. . . . . . . . . . . . . . . . . . . . . . . . . . . . 510.9.2
WARM AIR F571 - 592URNACE
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225.0
Heating systems . . . . . . . . . . . . . . . . . . . . . . . . . . 311.0 Located in under-floor spaces. . . . . . . . . . . . . . . . 608.0
WATER HEATERS
Accepted standards . . . . . . . . . . . . . . . . 1203.2, 1207.3,
Table 1203.2
Drain pans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305.5 Dual purpose . . . . . . . . . . . . . . . . . . . . . 1203.2, 1207.3,
Table 1203.2
For space heating and cooling . . . . . . . . . . . . . . . . 1203.2, Table 1203.2
Tankless . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1203.3
WELD, CONTINUOUS
Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .205.0
Joints . . . . . . . . . . . . . . . . . . . . . . . . . . . .212.0, 1211.14
Pressure Vessels . . . . . . . . . . . . . . . . . . . . . . . . .1003.5
Welded duct connections . . . . . . . . . . . . . . . .510.5.3.2
WORKMANSHIP . . . . . . . . . . . . . . . . . . . . . . . . . . . . .309.0
– Z –
ZONE
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228.0
HISTORY NOTE APPENDIX
CALIFORNIA CODE OF REGULATIONS, TITLE 24, PART 4
HISTORY:
For prior code history, see the History Note Appendix to the California Mechanical Code, 2022 Triennial Edition, effec- tive January 1, 2023.
1. (BSC 01/24, DSA-SS 01/24, DSA-SS 01/24 CWoRE, HCD 02/24, OSHPD 01/24, SFM 01/24) Adoption by reference the 2024 Uniform Mechanical Code with necessary amendments to become the 2025 California Mechanical Code, and repeal of the 2021 edition of the Uniform Mechanical Code. Effective on January 1, 2026.
Get a plain-English answer with a citation back to this text.
Ask AI about this code