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// CODE SNIPPET

505.3 Common Exhaust Systems for Domestic Kitchens Located in Multistory Structures

2017 FBC - Mechanical, 6th edition > 5 Exhaust Systems > 505 Domestic Kitchen Exhaust Equipment > 505.3 Common Exhaust Systems for Domestic Kitchens Located in Multistory Structures
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Where a common multistory duct system is designed and installed to convey exhaust from multiple domestic kitchen exhaust systems, the construction of the system shall be in accordance with all of the following:

  1. The shaft in which the duct is installed shall be constructed and fire-resistance rated as required by the Florida Building Code, Building.
  2. Dampers shall be prohibited in the exhaust duct, except as specified in Section 505.1. Penetrations of the shaft and ductwork shall be protected in accordance with Section 607.5.5, Exception 2.
  3. Rigid metal ductwork shall be installed within the shaft to convey the exhaust. The ductwork shall be constructed of sheet steel having a minimum thickness of 0.0187 inch (0.4712 mm) (No. 26 gage) and in accordance with SMACNA Duct Construction Standards.
  4. The ductwork within the shaft shall be designed and installed without offsets.
  5. The exhaust fan motor design shall be in accordance with Section 503.2.
  6. The exhaust fan motor shall be located outside of the airstream.
  7. The exhaust fan shall run continuously, and shall be connected to a standby power source.
  8. Exhaust fan operation shall be monitored in an approved location and shall initiate an audible or visual signal when the fan is not in operation.
  9. Where the exhaust rate for an individual kitchen exceeds 400 cfm (0.19 m3/s) makeup air shall be provided in accordance with Section 505.2.
  10. A cleanout opening shall be located at the base of the shaft to provide access to the duct to allow for cleanout and inspection. The finished openings shall be not less than 12 inches by 12 inches (305 mm by 305 mm).
  11. Screens shall not be installed at the termination.
  12. The common multistory duct system shall serve only kitchen exhaust and shall be independent of other exhaust systems.

Related Code Sections


505.3 Exhaust Systems, Common Exhaust Systems for Domestic Kitchens Located in Multistory Structures
Where a common multistory duct system is designed and installed to convey exhaust from multiple domestic kitchen exhaust systems, the construction ...
2017 FBC - Mechanical, 6th edition > 5 Exhaust Systems > 505 Domestic Kitchen Exhaust Equipment > 505.3 Common Exhaust Systems for Domestic Kitchens Located in Multistory Structures
505.3 Exhaust Systems, Common Exhaust Systems for Domestic Kitchens Located in Multistory Structures
Where a common multistory duct system is designed and installed to convey exhaust from multiple domestic kitchen exhaust systems, the construction ...
2020 FBC - Mechanical, 7th edition > 5 Exhaust Systems > 505 Domestic Kitchen Exhaust Equipment > 505.3 Common Exhaust Systems for Domestic Kitchens Located in Multistory Structures
2702.2.5 Electrical, Exhaust Systems
Standby power shall be provided for common exhaust systems for domestic kitchens located in multistory structures as required in Section 505.3 ...
2020 FBC - Building, 7th edition > 27 Electrical > 2702 Emergency and Standby Power Systems > 2702.2 Where Required > 2702.2.5 Exhaust Systems
505.1 Exhaust Systems, Domestic Systems
for domestic kitchen cooking appliances equipped with downdraft exhaust systems shall be permitted to be constructed of Schedule 40 PVC pipe and fittings ...
2014 FBC - Mechanical, 5th edition > 5 Exhaust Systems > 505 Domestic Kitchen Exhaust Equipment > 505.1 Domestic Systems
505.1 Exhaust Systems, Domestic Systems
Where domestic range hoods and domestic appliances equipped with downdraft exhaust are provided, such hoods and appliances shall discharge ...
2017 FBC - Mechanical, 6th edition > 5 Exhaust Systems > 505 Domestic Kitchen Exhaust Equipment > 505.1 Domestic Systems
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