Individuals understand how to use the parallel line development method to fabricate various sheet metal duct fittings and objects. They can identify the basic steps used to fabricate a grooved lock seam, flexible connection, square mitered fitting and double offset. They are able to fabricate a 90-degree square elbow and a 90-degree radius elbow. They know how to fabricate a rectangular duct section using a Pittsburgh lock, and they can fabricate a transition with two or three straight sides.

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