The aim of the project is to study and characterize a common heat recovery compact units taking into account the 2018 ErP legislation. This directive is mandatory for residential units following goals: (i) do not exceed specific energy consumption, (ii) grant a maximum sound level, (iii) provide different speeds, (iv) filter change visual signal and finally (v) the presence of a thermal bypass. Finally the cost of this heat recovery unit must be competitive in price terms.