Sheet Metal Ductwork Fabrication

Flue Gas Recirculation ductwork operates in one of the most punishing environments in industrial combustion. This ductwork carries hot, corrosive exhaust gases at high velocity as part of systems designed to reduce NOx emissions and improve burner efficiency. A failure in this kind of ductwork can mean costly downtime.

So our project building custom fabricated FGR ductwork weighing over 12,400 pounds was a mission critical job. Built from A36 carbon steel plate, channel, and angle alongside A516 pressure vessel plate, this ductwork was engineered for thermal stress, not just structural load.

Quality control on a project like this goes well beyond visual inspection. Southern Metal Fabricators performed Charpy impact testing — a standardized method that measures steel's toughness and resistance to sudden fracture under impact, especially at low temperatures. For a project destined for Calgary, Alberta, where winter temperatures are severe, this kind of testing is essential.

The finished ductwork was insulated and clad in-facility by a third-party specialist, painted gray, and documented thoroughly before being carefully coordinated across multiple shipments to the Canadian client.