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Chapter 7 — COMBUSTION AIR

701.11 Combustion Air Ducts. Combustion air ducts shall

California Mechanical Code (Title 24, Part 4) · 2019 edition · updated 2026-09-10 · California

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

comply with the following [NFPA 54:9.3.8]: (1) Ducts shall be constructed of galvanized steel or a mate rial having equivalent corrosion resistance, strength, and

(1) Ducts shall be constructed of galvanized steel or a mate rial having equivalent corrosion resistance, strength, and rigidity. Exception: Within dwellings units, unobstructed stud and joist spaces shall not be prohibited from conveying combustion air, provided that not more than one fireblock is removed. [NFPA 54:9.3.8.1] (2) Ducts shall terminate in an unobstructed space, allowing

free movement of combustion air to the appliances.

(2) Ducts shall terminate in an unobstructed space, allowing

free movement of combustion air to the appliances.

[NFPA 54:9.3.8.2] (3) Ducts shall serve a single space. [NFPA 54:9.3.8.3] (4) Ducts shall not serve both upper and lower combustion

air openings where both such openings are used. The sep

(4) Ducts shall not serve both upper and lower combustion

air openings where both such openings are used. The separation between ducts serving upper and lower combustion air openings shall be maintained to the source of combustion air. [NFPA 54:9.3.8.4] (5) Ducts shall not be screened where terminating in an attic

space. [NFPA 54:9.3.8.5]

(5) Ducts shall not be screened where terminating in an attic

space. [NFPA 54:9.3.8.5] (6) Combustion air intake openings located on the exterior of

the building shall have the lowest side of the combustion

(6) Combustion air intake openings located on the exterior of

the building shall have the lowest side of the combustion air intake openings located at least 12 inches (305 mm) vertically from the adjoining finished ground level.

[NFPA 54:9.3.8.8] (7) Horizontal upper combustion air ducts shall not slope

downward toward the source of combustion air. [NFPA

(7) Horizontal upper combustion air ducts shall not slope

downward toward the source of combustion air. [NFPA 54:9.3.8.6] (8) The remaining space surrounding a chimney liner, gas

vent, special gas vent, or plastic piping installed within a

(8) The remaining space surrounding a chimney liner, gas

vent, special gas vent, or plastic piping installed within a masonry, metal, or factory-built chimney shall not be used to supply combustion air. Exception: Direct-vent appliances designed for installation in a solid fuel-burning fireplace where installed in accordance with the manufacturer’s installation instructions. [NFPA 54:9.3.8.7]

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▸Contents — California Mechanical Code (Title 24, Part 4)
California Mechanical Code (Title 24, Part 4)
  1. Chapter 1 — GENERAL CODE PROVISIONS
  2. Chapter 2 — DEFINITIONS
  3. Chapter 3 — GENERAL REGULATIONS
  4. Chapter 4 — VENTILATION AIR
  5. Chapter 5 — EXHAUST SYSTEMS
  6. Chapter 6 — DUCT SYSTEMS
  7. ▸Chapter 7 — COMBUSTION AIR
    Overview
    1. 701.1 Applicability. 701.0 General. Air for combustion, ventil…
    2. 701.2 Pressure Difference. Where used, a draft hood or a
    3. 701.3 Makeup Air. Where exhaust fans, clothes dryers, and
    4. 701.4 Indoor Combustion Air. The required volume of
    5. 701.5 Indoor Opening Size and Location. Openings
    6. 701.6 Outdoor Combustion Air. Outdoor combustion air
    7. 701.7 Combination Indoor and Outdoor Combustion
    8. 701.10 Louvers, Grilles, and Screens. The required size
    9. 701.8 Engineered Installations. Engineered combustion
    10. 701.9 Mechanical Combustion Air Supply. Where combustion air i…
    11. 701.11 Combustion Air Ducts. Combustion air ducts shall
    12. 701.12 Dampers Prohibited. Combustion air ducts or
    13. 702.1 General.702.0 Extra Device or Attachment. No device or a…
  8. Chapter 8 — CHIMNEYS AND VENTS
  9. Chapter 9 — INSTALLATION OF SPECIFIC APPLIANCES
  10. Chapter 10 — BOILERS AND PRESSURE VESSELS
  11. Chapter 11 — REFRIGERATION
  12. Chapter 12 — HYDRONICS
  13. Chapter 13 — FUEL GAS PIPING
  14. Chapter 14 — PROCESS PIPING
  15. Chapter 15 — SOLAR ENERGY SYSTEMS
  16. Chapter 16 — STATIONARY POWER PLANTS
  17. Chapter 17 — REFERENCED STANDARDS
  18. Appendix A — RESIDENTIAL PLAN EXAMINER REVIEW FORM FOR HVAC SY…
  19. Appendix B — PROCEDURES TO BE FOLLOWED TO PLACE GAS EQUIPMENT …
  20. Appendix C — INSTALLATION AND TESTING OF OIL (LIQUID) FUEL-FIR…
  21. Appendix D — FUEL SUPPLY: MANUFACTURED/MOBILE HOME PARKS AND R…
  22. Appendix E — SUSTAINABLE PRACTICES
  23. Appendix F — SIZING OF VENTING SYSTEMS AND OUTDOOR COMBUSTION …
  24. Appendix G — EXAMPLE CALCULATION OF OUTDOOR AIR RATE

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