Plan, lays out, fabricates, assembles, installs, and repairs HVAC sheet metal parts, equipment, and products, utilizing knowledge of working characteristics of metallic and non-metallic materials, machining, and layout techniques, using hand tools, power tools, and machines, and equipment. Lays out and marks dimensions and reference lines on material, using scribers, dividers, squares and rulers, applying knowledge of shop mathematics and layout techniques to develop and trace patterns of product or parts or using templates.