DVN 5000
Environmental Guidelines
28
24-10520-22 Rev. –
This document contains confidential and proprietary information of Johnson Controls, Inc.
© 2009 Johnson Controls, Inc.
Inlet air filters are highly recommended and extend the service life of digital
equipment, as most switchers, routers, hubs, and other processing equipment have
their power supply fans in the rear, without any filtered front air intake.
Filters are especially important in environments with a high level of airborne
particles or dust. For example, the filters must be cleaned after the drywall is
installed, since drywall dust effectively blocks the filter.
Filter loading and subsequent maintenance requirements can be greatly reduced with
the use of a proportional thermostatic fan speed control circuit, since the overall
volume of air is lower when not required.
Good filters have a long service life and low static pressure drop. To avoid clogging,
regularly maintain and/or replace filters, as needed. Refer to the filter
manufacturer’s documentation for maintenance recommendations.
Also consider using a heat exchanger for keeping contaminants out of the enclosure
in very dusty environments or when maintenance is questionable.