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Code in many states requires 18 gauge ductwork if it is steel, 22 gauge if it is stainless. Galvanized ductwork can be at a minimum gauge of 18 as long as it can be welded. 16 gauge is sometimes used because it is easier to weld the seams. Welded grease tight seams are required. terminology keywords: Upblast Exhaust Fan, Exhaust Ventterminology keywords: Upblast Exhaust Fan, Exhaust Vent, Direct Drive Centrifugal Upblast Exhaust Fan== Gas Valve Cut Off ==terminology keywords: Gas Valve, Gas Valve Disconnect, Mechanical Shutoff Valve, Ansul Gas ValveShuts off gas to cooking equipment in the event of fire.