Clean
the projector's air filter or vents if they get dusty, or if you
see a message telling you to clean them. It is recommended that you
clean these parts at least once every three months, or more often
if you use the projector in an environment that is dustier than
expected.
Caution:
Do not use water or any detergent to
clean the air filter. Do not use canned air, or the gases may leave
a flammable residue.