What Type of Duct does a Type I Hood designed for Grease and Smoke removal require?
The Uniform Mechanical Code states that a Type I Hood must have a duct that is specifically designed for Grease laden air. The duct shall be constructed of at least. o55-inch-thick (1.40mm) ( No. 16 manufacture’s standard gage) steel or stainless steel at least .044 inch (1.10mm) in thickness continuously welded and water tight. You should consult with the Local Authority Having Jurisdiction for information regarding Type I duct requirements in your area prior to any engineering decisions or fabrication.