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Earlier editions: 20222019

Chapter 3 — GENERAL REGULATIONS

311.4 Return-Air Limitations — 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) § 311.4 · Effective January 1, 2026 · Official source: Building Standards Commission

Return air from one dwelling unit shall not discharge into another dwelling unit through the heating or cooling air system.

58 2025 CALIFORNIA MECHANICAL CODE

GENERAL REGULATIONS

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

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