flue pipe

A flue pipe is a type of organ pipe that produces sound when an air current strikes its lip, causing the air inside to vibrate. These pipes are a fundamental component of pipe organs, which are keyboard instruments that generate sound through tuned air columns within pipes.12

Flue pipes are one of the two main categories of organ pipes, the other being reed pipes. They are constructed from wood or metal and operate on a principle similar to a recorder or whistle. The pitch of a flue pipe is determined by its length, with longer pipes producing lower notes and shorter pipes producing higher notes. The tone quality is influenced by factors such as wind pressure, pipe dimensions, material, and the skill of the voicer who adjusts the pipe's lips and flue.2