This document specifies and classifies the component/product performance characteristics, which may be necessary for the design, rating and dimensioning, placing on the market of residential ventilation products and systems to provide the predetermined performance, 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 European and national regulations.The codification part in AnnexB and the classification part in Clause8 apply to the following products: unidirectional mechanical supply and exhaust residential ventilation units according to EN13141?4:2021 , EN13141?6:2014 and EN13141?11 ; ducted mechanical bidirectional residential ventilation units according to EN13141?7:2021 ; non-ducted mechanical bidirectional residential ventilation units according to prEN13141?8:2020 . This document 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 document specifies in AnnexZA and AnnexZB the requirements of EU1253/2014 and EU1254/2014 for residential ventilation units below 1000m3/h air volume flow.This document does not cover requirements raised by European Directives (e.g. low voltage directive, EMCdirective) and other requirements such as corrosion, reaction to fire and snow penetration.