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DIN EN 1506:2007
Ventilation for buildings - Sheet metal air ducts and fittings with circular cross-section - Dimensions; German version EN 1506:2007
This European Standard specifies dimensions of ducts and duct fittings with circular cross- section. It applies to ductwork used in ventilating and air conditioning systems in buildings, subject to human occupancy. The wall thickness of ducts and fittings is not specified in this standard.
Deutsches Institut für Normung [din]