The minimal duct thickness is defined by what ever code jurisdiction which the undertaking is located in. Down below are two code references connected with the needed thickness and product form for grease ducts. Overhang: The extraction Cover ought to overhang the cooking devices by a minimum of 250mm within https://grease-tight-extract-duct23455.mybuzzblog.com/16864008/examine-this-report-on-commercial-kitchen-extract-systems