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Chapter 8 — CHIMNEYS AND VENTS

802.8 Through-the-Wall Vent Termination.

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.

A mechanical draft venting system shall terminate at least 3 feet (914 mm) above any forced air inlet located within 10 feet (3048 mm). (See Figure 802.8) Exceptions: (1) This provision shall not apply to the combustion-air

intake of a direct-vent appliance.

(1) This provision shall not apply to the combustion-air

intake of a direct-vent appliance. (2) This provision shall not apply to the separation of the

integral outdoor-air inlet and flue gas discharge of listed

This provision shall not apply to the separation of the

integral outdoor-air inlet and flue gas discharge of listed outdoor appliances. [NFPA 54:12.9.1] 802.8.1 Mechanical Draft Venting System. A mechanical draft venting system of other than direct-vent type shall terminate not less than 4 feet (1219 mm) below, 4 feet (1219 mm) horizontally from, or 1 foot (305 mm) above a door, operable window, or gravity air inlet into a building. The bottom of the vent terminal shall be located not less than 12 inches (305 mm) above finished ground level. [NFPA 54:12.9.2]

2019 CALIFORNIA MECHANICAL CODE 143

CHIMNEYS AND VENTS any other purpose or distributed to any other persons or parti es.

FIGURE 802.8 EXIT TERMINALS OF MECHANICAL DRAFT AND DIRECT-VENT VENTING SYSTEMS

[NFPA 54: FIGURE A.12.9]

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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
  8. ▸Chapter 8 — CHIMNEYS AND VENTS
    Overview
    1. 801.1 Applicability.801.0 General. The requirements of this ch…
    2. 801.2 Venting of Gas Appliances. Low-heat and
    3. 801.3 Appliances Fueled by Other Fuels. Appliances
    4. 802.1 Listing.802.0 Venting of Appliances. Type B and Type B-W…
    5. 802.2 Connection to Venting Systems. Except as permitted in Se…
    6. 802.3 Design and Construction. Venting systems shall
    7. 802.4 Type of Venting System to be Used. The type of
    8. 802.5 Masonry, Metal, and Factory-Built Chimneys. Chimneys sha…
    9. 802.6 Gas Vents. The installation of gas vents shall meet
    10. 802.7 Single-Wall Metal Pipe. Single-wall metal pipe
    11. 802.8 Through-the-Wall Vent Termination. A mechanical draft ve…
    12. 802.9 Condensation Drain. Provision shall be made to
    13. 802.10 Vent Connectors for Category I Appliances.
    14. 802.11 Vent Connectors for Category II, Category III,and Categ…
    15. 802.12 Draft Hoods and Draft Controls. Vented appliances shall…
    16. 802.14 Obstructions. Devices that retard the flow of vent
    17. 802.13 Manually Operated Dampers. A manually operated damper s…
    18. 802.15 Automatically Operated Vent Dampers. An
    19. 803.1 Single Appliance Vent Table 803.1.2(1) through
    20. 803.2 Multiple Appliance Vent Table 803.2(1) through
  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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