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Duct

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A duct may refer to:

Telecommunication

  • Atmospheric duct, a horizontal layer in the lower atmosphere in which the vertical refractive index gradients are such that radio signals (a) are guided or ducted, (b) tend to follow the curvature of the Earth, and (c) experience less attenuation in the ducts than they would if the ducts were not present
  • Duct bank, a set of electrical conduits, entering a building underground


See also