Brussels, 2014 – Air filter manufacturers published a new Eurovent Recommendation defining an energy efficiency measuring method for air filters. In the context of increasing energy prices and the imperative of reducing CO2 emissions, the energy consumption related to air filters has become the focus of attention. Currently, air filters are classified only by their average particle collection efficiency according to the European standard EN 779. The aim of this guideline is to define a method of air filter evaluation with regard to energy-efficient operation, to give the user of air filters guidance for the filter selection. This document is available in English.