3443  Fabricated Plate Work (Boiler Shops)

Establishments primarily engaged in manufacturing power and marine boilers,
pressure and nonpressure tanks, processing and storage vessels, heat
exchangers, weldments and similar products, by the process of cutting,
forming and joining metal plates, shapes, bars, sheet, pipe mill products
and tubing to custom or standard design, for factory or field assembly.
Establishments primarily engaged in manufacturing warm air heating furnaces
are classified in industry 3585; those manufacturing other nonelectric
heating apparatus, except power boilers, are classified in industry 3433;
those manufacturing household cooking apparatus are classified in industry
3631; and those manufacturing industrial process furnaces and ovens are
classified in industry 3567.