Energy efficiency class
The energy efficiency index is calculated based on the annual power consumption of the hood at the optimum operating point and the nominal electrical power consumption of the lighting system.
This is a ratio calculation where you set the calculated annual consumption for the product (AEC) against a standard consumption (SAEC). Where 100 corresponds to the product having the same consumption as the standard unit, so the lower the number the better. The difference is then translated into a letter classification.
The starting point is an average usage time for the light of 2 hours per day, and an average usage time for the hood of 1 hour per day. If the hood has a consumption in switched off mode / standby mode, this is added.