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Earlier editions: 20222019

Chapter 6 — DUCT SYSTEMS

603.5 Plastic Ducts — 2025 California Mechanical Code

California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-25 · 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) § 603.5 · Effective January 1, 2026 · Official source: Building Standards Commission

Plastic air ducts and fittings shall be permitted where installed underground and listed for such

use.

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▸Contents — California Mechanical Code (Title 24, Part 4)
California Mechanical Code (Title 24, Part 4)

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