1. 
   Ducting
   A system of shafts or tubes designed to carry and protect cables or pipes.
   Found op http://www.selfbuildabc.co.uk/self-build-glossary.html
   
   
2. 
   Ducting
   A system of shafts or tubes designed to carry and protect cables or pipes.
   Found op http://www.encyclo.co.uk/local/20704
   
   
3. 
   ducting
   (from the article `telecommunications media`) ...body of water, with vapour concentration increasing closer to the surface, can cause a bending of the beam toward the Earth that is much sharper ...
   Found op http://www.britannica.com/eb/a-z/d/79
   
   
4. 
   ducting
   guided propagation of radio waves inside a tropospheric radio-duct NOTE - At sufficiently high frequencies, a number of electromagnetic modes of guided propagation can co-exist in the same tropospheric radio-duct.
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=705-05-50
   
   

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