Second edition. This document is provided by the Eurovent Association and was prepared by the Product Group 'Air Filters' (PG-FIL). The Eurovent Association does not grant any certification based on this document. Based on this document, filters can be evaluated and classified to their energy efficiency. Certification is granted by Eurovent Certita Certification, which is a legal entity different from the Eurovent Association. This document supersedes its previous edition and is available in English.