Profile: John Patrick Engineering Ltd. specializes in offering engineering and metal fabrication services. Our products are fabricated from steel (mild and stainless), Cromweld, aluminum and copper. Typical products include metal ducting & chimneys, structures, tanks, stairs, ladders & platforms, and dampers. Our ducting & chimneys are typically manufactured in mild steel, stainless steel or Cromweld. The materials used for manufacture range from 1.5 mm to 15 mm thickness, depending on the nature of the gases being transported.