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SMACNA 1108-2008
Accepted Industry Practice for Industrial Duct Construction, 2nd Ed
This guide is a compilation of accepted industry practices and construction reinforced or unreinforced, for operation from 4 in. to 20 in. wg positive or negative pressure, and from ambient to 650° F for carbon or stainless steel, 400° F for galvanized steel, and 120° F for aluminum. Also rectangular duct fabricated from panels from a few inches up to 5 ft wide, all welded, Pittsburgh, grooved seam pipe lock or standing seam joined duct, for operation from 4 in. to 20 in. wg positive or negative pressure, and for the same materials and temperature limits as round duct. Also includes chapters on industrial applications, material properties, hangers and supports, fittings, vents, doors, discharge ducts (small stacks) and surface preparation of metals.
American National Standards Institute [ansi]