a1s2d3f4 发表于 2021-5-25 13:45:56

求 UL 900 Standard for Air Filter Units 8th edition

求 UL 900 Standard for Air Filter Units  8th edition


guo_min_ 发表于 2021-5-25 13:45:57

http://bbs.infoeach.com/forum.php?mod=viewthread&tid=250190&extra=

刚在UL官网下载的，英文版
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