Excerpt from Practical Sheet Metal Duct Construction: A Treatise in the Construction and Erection of Heating and Ventilating Ducts
The modern demand for economy and efficiency in methods of production have given a strong impetus to specialization in the various branches of sheet metal work. In the larger cities are found very many shops that contract exclusively for heating and venti lating, exhaust pipes and ducts, etc. Only the well equipped, well-manned plant and only the skillful op crator thoroughly familiar with his special calling, can readily take advantage of the Opportunities presented in this large field.
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