Epson 5020UB - Manual (Page 71)

Maintenance
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3. Press in on the inner edge of the air filter cover to release the latch, then pull to remove
the cover.
4. Remove the air filter as shown.
5. Gently tap both sides of the air filter against a hard surface four
or five times to remove loose dust from the air filter.
Note: Do not use excessive force when tapping the air filter, or it
may crack and become unusable. Do not rinse the air filter in water,
or use any detergent or solvent to clean it. Do not used canned air,
or the gases may leave a residue.
6. Use a small vacuum cleaner that is designed for computers and
other office equipment to remove any remaining dust from the
surface of the filter. If you don’t have one, gently clean the
filter using a very soft brush (such as a clean artist’s
paintbrush).