California Mechanical Code (Title 24, Part 4)

2025 edition · Effective January 1, 2026 · Full text · Explained in plain English

Part 4 of Title 24 — HVAC, ventilation, exhaust and mechanical system requirements.

Edition: 2025
Effective: 2026-01-01
Last updated: 2026-09-25
Contents: 28 chapters · 1,097 sections
Jurisdiction: California

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