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Design Handbook on Animal Research Facilities Using Static Microisolators 
f v = 3.7 Hz for U d = 350 f/m 
Figure 4.1.03. Air velocity fluctuations in figures 4.1.01 and 4.1.02 through a low-pass filter. 
Secondary high frequency velocities were filtered out. Only primary flows with low frequencies 
are shown. Air velocity fluctuations in both primary flows (diffuser air velocity Ud = 350 fpm and 
150 fpm) were less than 4 Hz. 
