This industry comprises establishments primarily engaged in manufacturing one or more of the following: (1) prefabricated metal buildings, panels and sections; (2) structural metal products; and (3) metal plate work products. Making manufactured homes (i.e., mobile homes) and prefabricated wood buildings--are classified in Industry 32199, All Other Wood Product Manufacturing; Constructing buildings, bridges, and other heavy construction projects on site--are classified in Sector 23, Construction; Building ships, boats and barges--are classified in Industry 33661, Ship and Boat Building; Manufacturing power boilers and heat exchangers--are classified in Industry 332410, Power Boiler and Heat Exchanger Manufacturing; Manufacturing heavy gauge tanks--are classified in Industry 332420, Metal Tank (Heavy Gauge) Manufacturing; Manufacturing metal plate cooling towers--are classified in Industry 33341, Ventilation, Heating, Air-Conditioning, and Commercial Refrigeration Equipment Manufacturing; and Manufacturing metal windows, doors, and studs--are classified in Industry 33232, Ornamental and Architectural Metal Products Manufacturing.