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Chapter 5 — EXHAUST SYSTEMS

515.1 Cooking Equipment.Equipment. Cooking equipment shall be

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.

approved based on one of the following criteria: (1) Listings by a testing laboratory. (2) Test data acceptable to the Authority Having Jurisdiction.

[NFPA 96:12.1.1] 515.1.1 Installation. Listed appliances shall be installed in accordance with the terms of their listings and the manufacturer’s installation instructions. Solid fuel used for flavoring within a gas-operated appliance shall be in a solid fuel holder (smoker box) that is listed with the equipment. [NFPA 96:12.1.2.1, 12.1.2.1.1]

112 2019 CALIFORNIA MECHANICAL CODE

EXHAUST SYSTEM

515.1.1.1 Re-evaluation. Cooking appliances requiring protection shall not be moved, modified, or rearranged without prior re-evaluation of the fireextinguishing system by the system installer or servicing agent, unless otherwise allowed by the design of the fire-extinguishing system. A solid fuel holder shall not be added to an existing appliance until the fireextinguishing system has been evaluated by the fireextinguishing system service provider. [NFPA 96:12.1.2.2, 12.1.2.2.1] 515.1.1.2 Prior Location. The fire-extinguishing system shall not require re-evaluation where the cooking appliances are moved for the purpose of maintenance and cleaning, provided the appliances are returned to approved design location prior to cooking operations, and disconnected fire-extinguishing system nozzles attached to the appliances are reconnected in accordance with the manufacturer’s instructions and listing. [NFPA 96:12.1.2.3] 515.1.1.3 Minimum Space. Deep-fat fryers shall be installed with not less than a 16 inch (406 mm) space between the fryer and surface flames from adjacent cooking equipment. [NFPA 96:12.1.2.4] 515.1.1.4 Space Not Required. Where a steel or tempered glass baffle plate is installed not less than 8 inches (203 mm) in height between the fryer and surface flames of the adjacent appliance, the requirement for a 16 inch (406 mm) space shall not apply. [NFPA 96:12.1.2.5] 515.1.1.5 Minimum Height. Where the fryer and the surface flames are at different horizontal planes, a height of not less than 8 inches (203 mm) shall be measured from the higher of the two. [NFPA 96:12.1.2.5.1]

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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
    Overview
    1. 501.1 Applicability.501.0 General. This chapter includes requi…
    2. 502.2 Termination of Exhaust Ducts. Exhaust ducts shall
    3. 503.0 Motors, Fans, and Filters.503.1 General. Motors and fans…
    4. 503.2 Fans. Parts of fans in contact with explosive or flammab…
    5. 504.0 Environmental Air Ducts.504.1 General. Where not specifi…
    6. 504.2 Independent Exhaust Systems. Single or combined mechanic…
    7. 504.3 Domestic Range. Ducts used for domestic kitchen
    8. 504.4 Clothes Dryers. A clothes dryer exhaust duct shall
    9. 505.2 Incompatible Materials. Incompatible materials
    10. 505.3 Flammability Limit. Unless the circumstances stipulated …
    11. 504.5 Heat (Energy) Recovery Ventilators. Heat
    12. 504.6 Gypsum Wallboard Ducts. Bathroom and laundry
    13. 505.1 General.505.0 Product-Conveying Systems. A mechanical ve…
    14. 505.4 Air-Moving Devices. Air-moving devices shall be
    15. 505.5 Generating Flames, Sparks, or Hot Materials. Operations …
    16. 505.6 Fire Dampers. Fire dampers shall be permitted to be
    17. 505.8 Product-Conveying Ducts Classification. Product-conveyin…
    18. 505.7 Fire Detection and Alarm Systems. Unless the
    19. 505.9 Minimum Velocities and Circulation. The velocity and cir…
    20. 505.10 Makeup Air. Makeup air shall be provided to replenish a…
    21. 505.11 Hoods and Enclosures. Hoods and enclosures shall
    22. 506.2 Construction. Ducts used for conveying products
    23. 506.0 Product-Conveying Ducts.506.1 Materials. Materials used …
    24. 506.3 Penetrations. Exhaust ducts shall not pass through
    25. 506.5 Fittings. Fittings in Class 2, 3, and 4 systems shall be
    26. 506.4 Condensate. Joints in duct construction shall be liquidt…
    27. 506.6 Explosion Venting. Ducts conveying explosive dusts
    28. 506.9 Protection from Physical Damage. Ducts
    29. 506.7 Supports. Supports shall be of noncombustible materials,…
    30. 506.8 Fire Protection. Sprinklers or other fire-protection
    31. 506.11 Clearance Reduction Methods. It shall be permitted to p…
    32. 506.10 Duct Clearances. Unless the conditions in Section
    33. 507.4 Clearance. Where enclosures are not required, hoods,
    34. 507.1 Type I Hood Exhaust System.507.0 General Requirements. E…
    35. 507.2 Exhaust System. Cooking equipment used in
    36. 507.3 Listed Devices. Penetrations shall be sealed with
    37. 507.5 Drawings. A drawing(s) of the exhaust system installatio…
    38. 507.6 Notification of Change. Where required by the
    39. 508.1 Where Required.508.0 Type I Hoods. Type I hoods shall be…
    40. 508.2 Listed Type I Hood Assemblies. Listed hood
    41. 508.3 Construction of Type I Hoods. The hood or that
    42. 508.4 Supports. Hoods shall be secured in place [OSHPD 1,
    43. 508.5 Hood Size. Hoods shall be sized in accordance with
    44. 508.6 Solid-Fuel Hood Assemblies. Where solid-fuel
    45. 508.7 Exhaust Outlets. An exhaust outlet within an
    46. 509.0 Grease Removal Devices in Hoods.509.1 Grease Removal Dev…
    47. 509.2 Installation. The distance between the grease
    48. 509.3 Solid-Fuel Grease Removal Devices. Where
    49. 510.0 Exhaust Duct Systems.510.1 General. Ducts shall not pass…
    50. 510.2 Clearance. Clearance between ducts and combustible
    51. 510.3 Openings. Openings shall be provided at the sides
    52. 510.4 Listed Grease Ducts. Listed grease ducts shall be
    53. 510.5 Other Grease Ducts. Other grease ducts shall comply with…
    54. 510.6 Exterior Installations. The exterior portion of the
    55. 510.7 Interior Installations. In buildings more than one
    56. 510.8 Underground Installations. Grease ducts installed
    57. 511.0 Air Movement.
    58. 510.10 Solid-Fuel Duct Systems. Where solid-fuel cooking equip…
    59. 511.2 Airflow. The air velocity through a duct shall be not
    60. 511.3 Makeup Air. The makeup air quantity shall prevent
    61. 511.4 Common Duct (Manifold) Systems. Master
    62. 511.5 Solid-Fuel Air Movement Requirements. Where
    63. 512.1 Dampers.512.0 Auxiliary Equipment. Dampers shall not be …
    64. 512.2 Electrical Equipment. Wiring systems shall not be
    65. 512.3 Other Equipment. Fume incinerators, thermal recovery uni…
    66. 512.4 Solid-Fuel Auxiliary Equipment. Where solid fuel
    67. 513.2 Types of Equipment. Fire-extinguishing equipment
    68. 513.6 System Annunciation. Upon activation of an automatic fir…
    69. 513.3 Simultaneous Operation. Fixed pipe extinguishing systems…
    70. 513.4 Fuel and Electric Power Shutoff. Upon activation
    71. 513.5 Manual Activation. A readily accessible means for
    72. 513.7 System Supervision. Where electrical power is
    73. 513.8 Special Design and Application. Hoods containing automat…
    74. 513.9 Review and Certification. Where required, complete
    75. 513.10 Installation Requirements. Installation of systems
    76. 513.11 Portable Fire Extinguishers. Portable fire extinguisher…
    77. 513.12 Maintenance. Portable fire extinguishers shall be
    78. 513.13 Solid-Fuel Fire-Extinguishing Equipment. Where
    79. 514.0 Procedures for the Use, Inspection, Testing, and
    80. 514.2 Inspection, Testing, and Maintenance. Maintenance of the…
    81. 514.3 Inspection for Grease Buildup. The entire exhaust
    82. 514.4 Cleaning of Exhaust Systems. Where, upon
    83. 514.5 Cooking Equipment Maintenance. Inspection and
    84. 515.1 Cooking Equipment.Equipment. Cooking equipment shall be
    85. 515.2 Operating Controls. Deep-fat fryers shall be equipped
    86. 516.1 General Requirements.516.0 Recirculating Systems. Recirc…
    87. 516.2 Design Restrictions. Recirculating systems shall
    88. 516.6 Use and Maintenance. Automatic or manual covers
    89. 517.1 Venting Application.517.0 Solid-Fuel Cooking Operations.…
    90. 516.3 Interlocks. The recirculating system shall be provided w…
    91. 516.4 Location and Application Restrictions. The
    92. 516.5 Additional Fire Safety Requirements. In addition to the …
    93. 517.2 Location of Appliances. Appliances shall be
    94. 517.3 Hoods for Solid-Fuel Cooking. Hoods shall be
    95. 517.4 Exhaust Systems for Solid-Fuel Cooking. Where
    96. 517.6 Air Movement for Solid-Fuel Cooking. Exhaust
    97. 517.7 Fire-Extinguishing Equipment for Solid-FuelCooking. Soli…
    98. 517.8 Other Safety Requirements. Metal-fabricated solidfuel co…
    99. 518.4 Airflow Switch or Transducer. An airflow switch or
    100. 518.5 Surface Materials. Surfaces located directly above
    101. 518.0 Downdraft Appliances.518.1 General. A downdraft applianc…
    102. 518.2 Ventilation System. The downdraft appliance ventilation …
    103. 518.3 Fire-Extinguishing Equipment. Fire-extinguishing
    104. 519.0 Type II Hood Exhaust System Requirements.519.1 Where Req…
    105. 519.2 Construction of Type II Hoods. Type II hoods constructed…
    106. 519.3 Dishwashing Appliances. The net airflow for Type
    107. 519.4 Type II Exhaust Duct Systems. Ducts and plenums
    108. 519.5 Termination of Type II Hood Exhaust System.
    109. 519.6 Makeup Air. Makeup air shall be provided in accordance w…
  6. Chapter 6 — DUCT SYSTEMS
  7. Chapter 7 — COMBUSTION AIR
  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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