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This European Standard specifies and classifies the component/product performance characteristics which may be necessary for the design and dimensioning of residential ventilation systems to provide the predetermined comfort conditions of temperature, air velocity, humidity, hygiene and sound in the occupied zone. It defines those performance characteristics (mandatory or optional) which shall be determined, measured and presented according to relevant test methods. It provides a classification scheme which leads to a full definition of product properties based on test methods described in various EN Standards and gives an overview of the Test Standards. Distinction between mandatory and optional requirement is left to each national regulations. The codification part in Annex A and the classification part in Clause 4 apply to the following products: - mechanical supply and exhaust ventilation units for single dwellings according to EN 13141-7; - un-ducted mechanical supply and exhaust ventilation units for a single room according to EN 13141-8. This European Standard does not apply to other products such as filters, fire dampers, ducts, control devices and sound attenuators, which may also be incorporated in residential ventilation. This European Standard does not cover requirements raised by European Directives, for example: low voltage directive, EMC directive and other requirements such as corrosion, resistance and snow penetration.