Index — B
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
– B –
BAFFLE PLATE . . . . . . . . . . . . . . . . . . . . 204.0, 509.2.2.1,
509.2.2.3, 513.2.4.2, 515.1.1.4
BALANCING, HVAC . . . . . . . . . . . . . . . . . . . 314.0, E 502.3
E 503.6.5.3–E 503.6.5.3.2
BLEED LINES . . . . . . . . . . . . . . . . . . . . . . . 902.15, 1308.14
BOARD OF APPEALS . . . . . . . . . . . . . . . . . . . . . . . . . 107.0
BOILER
Clearance for access. . . . . . . . . . . . . . . . . . . . . . 1010.0
Clearance for connectors . . . . . . . . . . . . Table 802.7.3.3
Closet or alcove installation . . . . . . . . . . . . . . . . . 303.2
Combustion regulators . . . . . . . . . . . . . . . . . . . . 1009.0
Controls. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1003.2
Control diagram. . . . . . . . . . . . . . . . . . . . . . . . . . 1012.1
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0
General requirements. . . . . . . . . . . . . . . . . . Chapter 10
In hydronic systems . . . . . . . . . . . . . . . . . . . . . . . 1207.2
Inspections and tests. . . . . . . . . . . . . . . . . . . . . . 1013.0
Low-water cutoff . . . . . . . . . . . . . . . . . . . . . . . . . 1008.0
Mounting of. . . . . . . . . . . . . . . . . . . . . . 1001.5, 1001.5.1
Operation and maintenance . . . . . . . . . . . . . . . . 1014.0
Permit Fees . . . . . . . . . . . . . . . . . . . . . . . . . Table 104.5
Protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1005.0
Room . . . . . . . . . . . . . . . . . . . . . 204.0, 1001.2 , 1001.2.1
Venting of. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1001.6
BOILER TYPES
Automatic . . . . . . . . . . . 204.0, 1003.2.1, Table 1003.2.1
1003.3, 1003.4
Central heating. . . . . . . . . . . . . . . . . . . . . . 303.2, 904.0
Condensing . . . . . . . . . . . . . . . . . . . . . . . . . . . 1207.2.1
Electric . . . . . . . . . . . . . . . . . . . . . . 1002.3, E 503.5.7.3
High-pressure, definition . . . . . . . . . . . . . . . . . . . . 204.0
Low-pressure hot-water-heating,
definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0
Low-pressure steam-heating,
definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0
Miniature Boiler. . . . . . . . . . . . . . . . . . . . . 204.0, 1013.4
Noncondensing. . . . . . . . . . . . . . . . . . . . . . . . . 1207.2.2
Oil burning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1002.2
Package . . . . . . . . . . . . . . . . . . . 204.0, 1010.4, 1705.2,
Table E 503.7.1(6)
Power . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0, 1002.1,
Table 1003.2.1, 1010.2,
1010.3, 1013.4
Solid fuel . . . . . . . . . . . . . . . . . . . . . . 1002.4, 1003.2.1,
Table 1203.2
Steam and hot water. . . . . . . . . . . . . . . . . 204.0, 904.2,
Table 904.3.2, 904.5,
904.7, Table 1003.2.1,
1003.3, 1008.1, 1010.3,
1010.4, 1012.1, 1216.3,
1216.5, C 105.1
BONDING CONDUCTOR
OR JUMPER . . . . . . . . . . . . . . . . . . . . . . . . . . .204.0, 1311.0
BRAZED JOINTS . . . . . . . . . .(see Joints and connections)
BREECHING
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0
BRINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1105.3, 1108.1,
1109.9, 1116.5
BROILER UNITS
Open top unit . . . . . . . . . . . . . . . . 921.0, Table 1308.3.1
BUILDING
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0
BUILDING AUTOMATION SYSTEMS . . . . . . . . . . . . . . 306.2
BUILDING CODE
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0
BUILDING OFFICIAL
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 204.0
BUILDING STRUCTURAL MEMBERS . . . . . . 316.9, 603.3
BURNER ASSEMBLIES . . . . . . . . . . . . . . . . . . . . . . . 910.0
BURNER, CONVERSION . . . . . . . . . . . . . . Table 802.7.3.3,
802.10.1.2, 802.12,
802.12.1, 909.0, C 105.1
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