A corrugated metal vent pipe includes a helically corrugated pipe structureformed byhelical winding of a corrugated metal strip, wherein the helically corrugatedpipe structure hasa diameter of between 15 inches and 36 inches and a plurality of vent openingsdistributedthereon. A first pipe end treatment is located on a first end of the helicallycorrugated pipestructure, and a second pipe end treatment is located on a second end of thehelicallycorrugated pipe structure.
