Index — N
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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NATURAL VENTILATION
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.0
Floor area to be ventilated. . . . . . . . . . . . . . . . 402.2.1.2
Indoor air quality for
low-rise residential buildings . . . . . . . . . . . . . E 605.1
Indoor air quality for
residential occupancies . . . . . . . . . . . . . . . . . 405.1.1
Location and size openings. . . . . . . . . . . . . . . 402.2.1.6
Refrigeration systems . . . . . . . . . . . . . . . . . . . . . 1106.3
Systems . . . . . . . . . . . . . . . . . . . . . . . . 402.2, 402.2.1.2
NEONATAL INTENSIVE CARE UNITS
Formula preparation area . . . . . . . . . . . . . . . . . . . 419.1
Treatment Area/Room . . . . . . . . . . . . . . . . . . . . . . 419.2
NONCOMBUSTIBLE MATERIAL
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.0
NON-GREASE DUCTS . . . . . . . . . . . . . . . . . . . . . . . . 519.4
NUISANCE
Definition. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216.0
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