1013.4 Power and Miniature Boilers. Power boilers and

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.

miniature boilers shall be inspected externally annually. Where construction and operating conditions permit, they shall be subject to inspection internally annually.

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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
▸Chapter 10 — BOILERS AND PRESSURE VESSELS
Overview
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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