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Uniform Plumbing Code. Designated as an American National Standard, the Uniform Plumbing Code (UPC) is a model code developed by the International Association of Plumbing and Mechanical Officials (IAPMO) to govern the installation and inspection of plumbing systems as a means of promoting the public's health, safety and welfare.
Edge-blown aerophones or flutes (421) The player makes a ribbon-shaped flow of air with his lips (421.1), or his breath is directed through a duct against an edge (421.2). Flute. 421.1 Flutes without duct - The player himself creates a ribbon-shaped stream of air with his lips.