Architects and engineers have two options for specifying the design and construction of kitchen hood (Type 1) exhaust duct, more commonly known as grease duct, per mechanical code requirements: field fabricated and listed (3rd party safety certified) factory-built, modular duct. The field fabricated grease duct is typically rectangular and made of 16 gauge, welded carbon steel. The factory-built design is cylindrical and made of 20 gauge stainless steel.
UL1978 Listed grease ducts have been acknowledged as acceptable alternatives to field fabricated grease ducts since the mid 1990’s in the various codes.
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