This part of EN 13141 specifies the laboratory test methods and test requirements for the testing of aerodynamic, thermal and acoustic performance, and the electrical power of a mechanical supply and exhaust ventilation unit used in a single dwelling. It covers unit that contain at least, within one or more casing: supply and exhaust air fans; air filters air-to-air heat exchanger and/or Exhaust Air-to-Outdoor Air heat pump for exhaust air heat recovery; control system. Such equipment can be provided in more than one assembly, the separate assemblies of which are designed to be used together. The different possible arrangements of heat recovery heat exchangers and/or heat pumps are described in Annex A. This standard does not deal with non-ducted units. This standard does not deal with collective units (centralised or semi-centralised systems) This standard does not cover ventilation systems that may also provide and water space heating and hot water production This standard does not cover units including combustion engine driven compression heat pumps and absorption heat pump. Electrical safety requirements are given in EN 60335-2-40 and EN 60335-2-80.