Johnson Controls DVN 5000 Series, Manual, Page: 16 / 46

DVN 5000 Environmental Guidelines
14 24-10520-22 Rev. –
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2009 Johnson Controls, Inc.
For racks in the middle of a multi-bay installation, there are no exposed sides;
therefore, the only way to introduce air is through the front of the rack. Additionally,
incorporating a fan top is the best way to exhaust the air.
When top-mount fans are required, select an enclosure without venting built-in to
the top face. This helps prevent air from short-circuiting (see “Forced Air (Fans)” on
page 24).
Figure 5: Chimney Effect on Front Air Intake
Many enclosure manufacturers do not take proper thermal engineering into
consideration, so select your enclosure carefully.