• Minimum requirements from January 1, 2016: The units must save at least as much primary energy (electricityand heat) as they use (electricity)
  • Minimum requirements from January 1, 2018: The units must save significantly more primary energy than they use – the ventilation heat requirement of the residential building will be approximately halved
  • Energy efficiency label from A+ to G (see Fig. 2)

The energy label should permit the end user to compare products easily, enabling them to select energy-efficient products. In contrast to other electrical equipment, the energy classes on the labels of residential ventilation equipment are determined by a calculated parameter, the specific energy consumption, or SEC. This value should display the energy-saving potential of the equipment used in kilowatt hours per m² per year.


-42 SEV in kWh/a.m² 

 A+ (highest efficency)

 SEV < -42 


-42 ≤ SEV -34 


-34 ≤ SEV -26 


-26 ≤ SEV -23


-23 ≤ SEV -20


-20 ≤ SEV -10 


-10 ≤ SEV -0

 G (lowest efficency) 

   0 ≤ SEV














SEC value and energy class assignment.

Central residential ventilation unit with heat recovery

As shown in Figure 2, this is not only influenced by known parameters such as electrical power consumption or heat recovery, but, to a great degree, by the mode of operationas well.

So a Unit X may well achieve a better energy class when operated according to demand (e.g. moisture and CO2 sensors influence the air quantity), than in a time controlled or manually-controlled version.

Central extract air fan without heat recovery

Exhaust systems without heat recovery score worse than units with heat recovery, since the exhaust heat is lost. For exhaust systems, the mode of operation also has a large influence on the energy class.

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