Experimental research on atmospheric dust leakage of HEPA filters: part 5 of the series of research practice of the national standard task group for the Code for cleanroom construction and acceptance
Yao Dan,Wang Rong, Li Shuyun, Xu Zhonglin, Zhang Yizhao, Zhang Yanguo, Niu Weile, Cao Guoqing and Feng Xin
2015.03.12
Uses atmospheric dust as upstream aerosol challenge and pricks a pinhole of diameter 0.6 mm or 1.0 mm on a HEPA filter. The results show that leakage can still be detected with 5~10 particles per liter sampled downstream when the upstream concentration is as low as 300~400 particles per liter.