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Chapter 8 — CHIMNEYS AND VENTS

802.13 Manually Operated Dampers.

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 manually operated damper shall not be placed in an appliance vent connector. Fixed baffles shall not be classified as manually operated dampers. [NFPA 54:12.14]

Vents for appliance draft hood outlets or flue collars

12 inches (305mm) in diameter or smaller are not reduced more than one table size.

(5) Approved economizers, heat reclaimers, and recupera tors installed in venting systems of appliances not required to be equipped with draft hoods, provided the appliance manufacturer’s installation instructions cover the installation of such a device in the venting system and performance in accordance with Section 802.3 and Section 802.3.1 is obtained. [NFPA 54:12.16]

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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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