DIN EN ISO 16890-4:2020 一般通风用空气过滤器 第4部分:确定最小分数测试效率的调节方法(ISO/DIS 16890-4:2020)
Air filters for general ventilation - Part 4: Conditioning method to determine the minimum fractional test efficiency (ISO/DIS 16890-4:2020); German and English version prEN ISO 16890-4:2020