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// CODE SNIPPET

506.3.6 Grease Duct Clearances

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
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Where enclosures are not required, grease duct systems and exhaust equipment serving a Type I hood shall have a clearance to combustible construction of not less than 18 inches (457 mm), and shall have a clearance to noncombustible construction and gypsum wallboard attached to noncombustible structures of not less than 3 inches (76 mm).

Exceptions:

  1. Factory-built commercial kitchen grease ducts listed and labeled in accordance with UL 1978.
  2. Listed and labeled exhaust equipment installed in accordance with Section 304.1.
  3. Where commercial kitchen grease ducts are continuously covered on all sides with a listed and labeled field-applied grease duct enclosure material, system, product or method of construction specifically evaluated for such purpose in accordance with ASTM E2336, the required clearance shall be in accordance with the listing of such material, system, product or method.

Related Code Sections


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
506.3.7 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
506.3.1.1 Exhaust Systems, Grease Duct Materials
Grease ducts serving Type I hoods shall be constructed of steel having a minimum thickness of 0.0575 inch (1.463 mm) (No. 16 gage) or stainless steel ...
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 > 506.3.1 Duct Materials > 506.3.1.1 Grease Duct Materials
506.3.2.5 Exhaust Systems, Grease Duct Test
Prior to the use or concealment of any portion of a grease duct system, a leakage test shall be performed. Ducts shall be considered to be concealed ...
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 > 506.3.2 Joints, Seams and Penetrations of Grease Ducts > 506.3.2.5 Grease Duct Test
506.3.3 Exhaust Systems, Grease Duct Supports
Grease duct bracing and supports shall be of noncombustible material securely attached to the structure and designed to carry gravity and seismic ...
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 > 506.3.3 Grease Duct Supports
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