Duct is attached to the top of a range hood and serves to exhaust cooking contaminants to the outside air. The duct should be attached to an appropriate wall louver or roof jack.

usually round or rectangular metal pipes installed for distributing warm (or cold) air from the furnace to rooms in the home.

A system of shafts or tubes designed to carry and protect cables or pipes.

Guiding of electromagnetic radiation by refraction due to index gradients in the atmosphere.

See Trapping.