Ch. 6 Duct Systems — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-10-19 · 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) Chapter 6 · Effective January 1, 2026 · Official source: Building Standards Commission
(Matrix Adoption Tables are non-regulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
| Adopting Agency | BSC | BSC-CG | SFM | HCD 1 | HCD 2 | HCD 1-AC | DSA AC | DSA SS | DSA SS/CC | OSHPD 1 | OSHPD 1R | OSHPD 2 | OSHPD 3 | OSHPD 4 | OSHPD 5 | OSHPD 6 | BSCC | DPH | AGR | DWR | CEC | CA | SL | SLC |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Adopt Entire Chapter | X | X | X | |||||||||||||||||||||
| Adopt Entire Chapter as amended (amended sections listed below) | X | X | X | X | X | X | X | X | X | |||||||||||||||
| Adopt only those sections that are listed below | X | |||||||||||||||||||||||
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| 601.2.1 | X | |||||||||||||||||||||||
| 602.1 | X | X | X | X | X | X | ||||||||||||||||||
| 603.4.1 | † | † | † | † | † | |||||||||||||||||||
| 603.4.1.1 | X | X | X | X | X | |||||||||||||||||||
| 603.9.2 | † | † | ||||||||||||||||||||||
| 603.9.2.1 | X | |||||||||||||||||||||||
| 605.1 | X | X | X | X | X | X | ||||||||||||||||||
| 605.2 | X | X | X | X | ||||||||||||||||||||
| 605.3 | X | X | X | X | ||||||||||||||||||||
| 606.1 | X | X | ||||||||||||||||||||||
| 606.4.1 | X | |||||||||||||||||||||||
| 607.1.1 | X | X | X | X | X | X | ||||||||||||||||||
| 609.1 | X | |||||||||||||||||||||||
| 609.1.1 | X | |||||||||||||||||||||||
| 609.2 | X |
This state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.0.
CHAPTER 6
DUCT SYSTEMS
601.0 General.¶
602.0 Material.¶
603.0 Installation of Ducts.¶
604.0 Furnace Plenums and Air Ducts Used in Fuel-Gas Appliances.¶
Gas Appliances.
605.0 Insulation of Ducts.¶
606.0 Smoke Dampers, Fire Dampers, and Ceiling Dampers.¶
Dampers.
607.0 Ventilating Ceilings.¶
608.0 Use of Under-Floor Space as Supply Plenum for Dwelling Units.¶
for Dwelling Units.
609.0 Automatic Shutoffs.¶
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