SIC Code 3444-04 - Duct & Duct Fittings (Manufacturing)

Marketing Level - SIC 6-Digit

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SIC Code 3444-04 Description (6-Digit)

Duct & Duct Fittings (Manufacturing)" is a subdivision of the "Sheet Metal Work (Manufacturing)" industry that involves the production of ducts and fittings made of sheet metal. These ducts and fittings are used in HVAC (heating, ventilation, and air conditioning) systems to transport air and other gases. The manufacturing process involves cutting, bending, and shaping sheet metal into various sizes and shapes to create ducts and fittings that meet the specific requirements of the HVAC system. The industry also includes the production of accessories such as dampers, grilles, and diffusers that are used in conjunction with ducts and fittings.

Hierarchy Navigation for SIC 6-Digit Code 3444-04

Parent Code (less specific)


  • Sheet metal shears
  • Press brakes
  • Roll formers
  • Plasma cutters
  • Spot welders
  • Lock formers
  • Pittsburgh machines
  • Duct cutters
  • Duct notchers
  • Duct stretchers
  • Duct hangers
  • Duct sealants
  • Duct insulation
  • Duct connectors
  • Duct clamps
  • Duct tape
  • Duct knives
  • Duct crimpers
  • Duct flangers
  • Duct expanders

Industry Examples of Duct & Duct Fittings (Manufacturing)

  • HVAC ducts
  • Duct fittings
  • Dampers
  • Grilles
  • Diffusers
  • Elbows
  • Tees
  • Reducers
  • Transitions
  • Plenums
  • Collars
  • Takeoffs
  • Access doors
  • Louvers
  • Registers
  • VAV boxes
  • Sound attenuators
  • Fire dampers
  • Smoke dampers
  • Flexible ducts

SIC Code 3444-04 - Duct & Duct Fittings (Manufacturing)

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