Epson BrightLink 1485Fi 5000-Lumen Pixel-Shift Full HD Ultra-Short Throw 3LCD Interactive Laser Projector - Manual (Page 327)

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Replacing the Air Filter
You need to replace the air filter in the following situations:
• After cleaning the air filter, you see a message telling you to clean or replace it
• The air filter is torn or damaged
You can replace the air filter while the projector is mounted on the wall or ceiling.
1. Turn off the projector and unplug the power cord.
2. Loosen the screws securing the air filter cover.
3. Open the air filter cover.