Dell OptiPlex XE (Early 2010) - Manual (Page 10)

Cleaning the Dust Filter on the IP51 Kit
The IP51 kit has removable dust filters on front and back panels to prevent
dust from entering the computer. It is recommended that you regularly clean the
dust filters using a wet towel, a soft brush, or a vacuum cleaner.
CAUTION: Do not use a hard brush or any other hard material to clean the dust filters.
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1 front panel dust filter 2 back panel dust filter
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