In November 2015, members of the Eurovent Product Group ‘Air Filters’ published the first edition of Recommendation 4/22, providing the industry as well as European institutions with a scheme for energy performance measuring. This Recommendation refers to particulate air filters for residential application having an efficiency ePM1 of less than 99 %. It describes the technical specifications, requirements and an efficiency classification system based upon fractional efficiency measurement and a Particulate Matter reporting system The method is applicable for filters having rated maximum air flow from 70 to 1000 m³/h. According to Mr Jan Andersson, Chairman of the Eurovent Product Group ‘Air Filters’, the new testing method would ‘bring clarity to the market by covering an area that had so far not been fully covered by ISO or EN standards’. He goes on stating that the industry recommendation would ‘contribute to a level-playing field through ensuring comparable test results that are based on the same testing method’. This document is available in English.