Sheet metal & Air Conditioning Contractors’ National Association

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Accepted Industry Practice for Industrial Duct Construction

By SMACNA

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This guide is a compilation of accepted industry practices and construction techniques having received wide acceptance for the fabrication and installation of industrial duct systems. Covers round (long-seam and spiral) duct from 4 in. to 60 in. in diameter, reinforced or unreinforced, for operation from 4 in. to 20 in. wg positive or negative pressure, and from ambient to 650ºF for carbon or stainless steel, 400ºF for galvanized steel, and 120ºF 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 to 20 in. wg positive or negative pressure, and for the same materials and temperature limits as round duct. Includes chapters on:

  • industrial applications,
  • material properties,
  • hangers and supports,
  • fittings,
  • vents,
  • doors,
  • discharge ducts (small stacks,) and
  • surface preparation of metals.