Air filter for general ventilation - Part 2: Measurement of fractional efficiency and air flow resistance (ISO/DIS 16890-2:2014); German version prEN ISO 16890-2:2014
Air filters for general ventilation - Part 2: Measurement of fractional efficiency and air flow resistance (ISO 16890-2:2016); German version EN ISO 16890-2:2016— 78 стр.