905.3 Installation of Duct Furnaces. Duct furnaces shall

California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-09-10 · California

Italicized text is a California amendment to the model code, as printed in the official publication.

be installed in accordance with the manufacturer’s instruc tions. [NFPA 54:10.9.3]

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

California Mechanical Code (Title 24, Part 4)

Chapter 1 — GENERAL CODE PROVISIONS
Chapter 2 — DEFINITIONS
Chapter 3 — GENERAL REGULATIONS
Chapter 4 — VENTILATION AIR
Chapter 5 — EXHAUST SYSTEMS
Chapter 6 — DUCT SYSTEMS
Chapter 7 — COMBUSTION AIR
Chapter 8 — CHIMNEYS AND VENTS
▸Chapter 9 — INSTALLATION OF SPECIFIC APPLIANCES
Overview
Chapter 10 — BOILERS AND PRESSURE VESSELS
Chapter 11 — REFRIGERATION
Chapter 12 — HYDRONICS
Chapter 13 — FUEL GAS PIPING
Chapter 14 — PROCESS PIPING
Chapter 15 — SOLAR ENERGY SYSTEMS
Chapter 16 — STATIONARY POWER PLANTS
Chapter 17 — GEOTHERMAL ENERGY SYSTEMS AND AMBIENT TEMPERATURE…
Chapter 18 — REFERENCED STANDARDS
Appendix A — RESIDENTIAL PLAN EXAMINER REVIEW FORM FOR HVAC SY…
Appendix B — PROCEDURES TO BE FOLLOWED TO PLACE GAS EQUIPMENT …
Appendix C — INSTALLATION AND TESTING OF OIL (LIQUID) FUEL-FIR…
Appendix D — FUEL SUPPLY: MANUFACTURED/MOBILE HOME PARKS AND R…
Appendix E — SUSTAINABLE PRACTICES
Appendix F — SIZING OF VENTING SYSTEMS AND OUTDOOR COMBUSTION …
Appendix G — EXAMPLE CALCULATION OF OUTDOOR AIR RATE
Appendix H — PROFESSIONAL QUALIFICATIONS
Appendix I — INDOOR HORTICULTURAL FACILITIES
Appendix J — CLEAN AIR DELIVERY

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