// CODE SNIPPET
506.3.10 Underground Grease Duct Installation
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Underground grease duct installations shall comply with all of the following:
- 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).
- 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.
- The underground duct system shall be completely encased in concrete with a minimum thickness of 4 inches (102 mm).
- Ducts shall slope toward grease reservoirs.
- A grease reservoir with a cleanout to allow cleaning of the reservoir shall be provided at the base of each vertical duct riser.
- Cleanouts shall be provided with access to permit cleaning and inspection of the duct in accordance with Section 506.3.
- Cleanouts in horizontal ducts shall be installed on the topside of the duct.
- Cleanout locations shall be legibly identified at the point of access from the interior space.
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