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// CODE SNIPPET

506.3.10 Underground Grease Duct Installation

2014 FBC - Mechanical, 5th edition > 5 Exhaust Systems > 506 Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment > 506.3 Ducts Serving Type I Hoods > 506.3.10 Underground Grease Duct Installation
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Underground grease duct installations shall comply with all of the following:

  1. Underground grease ducts shall be constructed of steel having a minimum thickness of 0.0575 inch (1.463 mm) (No. 16 gage) and shall be coated to provide protection from corrosion or shall be constructed of stainless steel having a minimum thickness of 0.0450 inch (1.140 mm) (No. 18 gage).
  2. The underground duct system shall be tested and approved in accordance with Section 506.3.2.5 prior to coating or placement in the ground.
  3. The underground duct system shall be completely encased in concrete with a minimum thickness of 4 inches (102 mm).
  4. Ducts shall slope toward grease reservoirs.
  5. A grease reservoir with a cleanout to allow cleaning of the reservoir shall be provided at the base of each vertical duct riser.
  6. Cleanouts shall be provided with access to permit cleaning and inspection of the duct in accordance with Section 506.3.
  7. Cleanouts in horizontal ducts shall be installed on the topside of the duct.
  8. Cleanout locations shall be legibly identified at the point of access from the interior space.

Related Code Sections


506.3.10 Exhaust Systems, Underground Grease Duct Installation
Underground grease duct installations shall comply with all of the following: Underground grease ducts shall be constructed of steel having ...
2017 FBC - Mechanical, 6th edition > 5 Exhaust Systems > 506 Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment > 506.3 Ducts Serving Type I Hoods > 506.3.10 Underground Grease Duct Installation
506.3.10 Exhaust Systems, Underground Grease Duct Installation
Underground grease duct installations shall comply with all of the following: Underground grease ducts shall be constructed of steel having ...
2014 FBC - Mechanical, 5th edition > 5 Exhaust Systems > 506 Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment > 506.3 Ducts Serving Type I Hoods > 506.3.10 Underground Grease Duct Installation
506.3.10 Exhaust Systems, Underground Grease Duct Installation
Underground grease duct installations shall comply with all of the following: Underground grease ducts shall be constructed of steel having ...
2020 FBC - Mechanical, 7th edition > 5 Exhaust Systems > 506 Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment > 506.3 Ducts Serving Type I Hoods > 506.3.10 Underground Grease Duct Installation
Section 506 Exhaust Systems, Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment
Underground grease duct installations shall comply with all of the following: Underground grease ducts shall be constructed of steel having ...
2020 FBC - Mechanical, 7th edition > 5 Exhaust Systems > 506 Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment
603.8 Duct Systems, Underground Ducts
Ducts shall be approved for underground installation. Metallic ducts not having an approved protective coating shall be completely encased ...
2017 FBC - Mechanical, 6th edition > 6 Duct Systems > 603 Duct Construction and Installation > 603.8 Underground Ducts
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