DS DS/EN 14239
DS DSEN 14239 2004-APR-29 Ventlaton for buldngs - Ductwork - Measurement of ductwork surface area
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This standard specifies the requirements for the measurement of the surface area of a duct for use in the determination of air leakage flow rate per unit surface area (leakage factor). The standard is applicable to circular and rectangular ducts and components used in air conditioning and ventilation systems in buildings.