Johnson Controls DVN 5000 Series, Manual, Page: 29 / 46

Figure 17: Parallel and Series Fans Performance Chart
Figure 16: Typical Performance Curves: Fans and Blowers
Environmental Guidelines DVN 5000
24-10520-22 Rev. – 27
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© 2009 Johnson Controls, Inc.
Filters
Rack filters, which can be mounted over fans or used as a filtered vent panel, help
protect digital and other sensitive equipment from
hygroscopic dust failure (i.e.
when dust absorbs moisture and deposits itself on circuit boards, causing an
equipment failure). This problem occurs in humid environments (generally 65%
relative humidity or higher). Computers and other digital equipment utilizing rapid
clock rates are most affected by this problem.