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Explanation: Dado el poquito contexto, me atrevo a sugerirle que se trate del Código de Conducción de la ASME (American Society of Mechanical Engineers)
§ 3.133. Flue connection.
Each gas-fired or oil-fired boiler shall be equipped with a minimum 4 inch vent pipe or flue extended to an approved location outside the building or connected to a chimney flue. Where the horizontal run is more than 10 feet the vent shall be increased to a minimum of 6 inches. A draft hood of approved design shall be provided on each boiler.
This section cited in 34 Pa. Code § 3.131 (relating to reference to ASME Code); and 34 Pa. Code § 13.51 (relating to direct and indirect fired vaporizers).