This European Standard defines the test methods and performance characteristics for rigid or semi-rigid non-metallic ductwork which are used for ventilation and air conditioning of buildings. This standard does not include flexible ducts such as textile liners, spiral ductwork or others which are handled in EN 13180 or ductwork made from insulation duct board handled in EN 13403. Requirements for the air tightness of the ventilation system for non-residential buildings are given in EN 16798-3. For residential buildings, it is essential to apply national rules. The standard is developed to test rigid or semi-rigid ventilation ducts and their components under laboratory conditions. It is essential to perform tests on site in accordance with EN 12599. The test methods and performance characteristics are valid for ventilation ducts with circular, rectangular or other cross sections. This standard covers non-fire rated and fire rated ductwork. It is essential to also test fire rated ventilation ductwork in accordance with EN 1366-1.