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// CODE SNIPPET

506.3.7 Prevention of Grease Accumulation in Grease Ducts

Mechanical Code 2018 of Maryland > 5 Exhaust Systems > 506 Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment > 506.3 Ducts Serving Type I Hoods > 506.3.7 Prevention of Grease Accumulation in Grease Ducts
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Duct systems serving a Type I hood shall be constructed and installed so that grease cannot collect in any portion thereof, and the system shall slope not less than one-fourth unit vertical in 12 units horizontal (2-percent slope) toward the hood or toward a grease reservoir designed and installed in accordance with Section 506.3.7.1. Where horizontal ducts exceed 75 feet (22 860 mm) in length, the slope shall be not less than one unit vertical in 12 units horizontal (8.3-percent slope).

506.3.7.1 Grease Duct Reservoirs

Grease duct reservoirs shall:
  1. Be constructed as required for the grease duct they serve.
  2. Be located on the bottom of the horizontal duct or the bottommost section of the duct riser.
  3. Extend across the full width of the duct and have a length of not less than 12 inches (305 mm).
  4. Have a depth of not less than 1 inch (25 mm).
  5. Have a bottom that slopes to a drain.
  6. Be provided with a cleanout opening constructed in accordance with Section 506.3.8 and installed to provide direct access to the reservoir. The cleanout opening shall be located on a side or on top of the duct so as to permit cleaning of the reservoir.
  7. Be installed in accordance with the manufacturer's instructions where manufactured devices are utilized.

Related Code Sections


506.3.7 Exhaust Systems, Prevention of Grease Accumulation in Grease Ducts
Duct systems serving a Type I hood shall be constructed and installed so that grease cannot collect in any portion thereof, and the system shall ...
Mechanical Code 2018 of Maryland > 5 Exhaust Systems > 506 Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment > 506.3 Ducts Serving Type I Hoods > 506.3.7 Prevention of Grease Accumulation in Grease Ducts
506.3.6 Exhaust Systems, Grease Duct Clearances
Where enclosures are not required, grease duct systems and exhaust equipment serving a Type I hood shall have a clearance to combustible ...
Mechanical Code 2018 of Maryland > 5 Exhaust Systems > 506 Commercial Kitchen Hood Ventilation System Ducts and Exhaust Equipment > 506.3 Ducts Serving Type I Hoods > 506.3.6 Grease Duct Clearances
506.3 Plumbing Facilities and Fixture Requirements, Grease Interceptors
instructions. Grease interceptors and automatic grease removal devices shall be regularly serviced and cleaned to prevent the discharge of oil, grease ...
Property Maintenance Code 2012 of Maryland > 5 Plumbing Facilities and Fixture Requirements > 506 Sanitary Drainage System > 506.3 Grease Interceptors
1003.3 Traps, Interceptors and Separators, Grease Interceptors
or other constraints prevent the installation or replacement of a grease interceptor, one or more grease interceptors shall be permitted to be installed ...
Plumbing Code 2018 of Maryland > 10 Traps, Interceptors and Separators > 1003 Interceptors and Separators > 1003.3 Grease Interceptors
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 ...
Mechanical Code 2018 of Maryland > 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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