Air filters for general ventilation - Part 4: Conditioning method to determine the minimum fractional test efficiency (ISO/DIS 16890-4:2015); German and English version prEN ISO 16890-4:2015
Air filters for general ventilation - Part 4: Conditioning method to determine the minimum fractional test efficiency (ISO 16890-4:2016); German version EN ISO 16890-4:2016— 20 стр.
