When and how should I clean or replace the air filter?

• Clean the filter if dust collects on the air filter or vent on the bottom of the projector.
  
  Note: Gently remove the dust using a small vacuum designed for computers or a very soft brush (such asa paintbrush).
  
  Caution: Do not use canned air, or the gases may leave residue.
  
  Related references
  Cleaning the Air Filter
  Replacing the Air Filter