Duct Work & Transition Pieces 60″ Diameter Carbon Steel Duct Work with Tied Universal Expansion Joints and a 45 Degree Mitered Elbow Designed for a Flue Gas System in an Oil Refinery Engine Exhaust Duct Spool to Direct Engine Exhaust in a Gas Storage Facility 96″ Diameter Stainless Steel Duct Work for an Acid Plant 96″ Diameter Stainless Steel Duct Work for an Acid Plant 96″ Diameter Stainless Steel Duct Work for an Acid Plant 96″ Diameter Stainless Steel Duct Work for an Acid Plant 90″ Diameter Duct Work for an Ammonia Plant 90″ Diameter Duct Work for an Ammonia Plant SWECO Fab Duct Work & Transition Pieces Duct work Ductwork Duct work 1 Duct work