Epson EpiqVision Ultra LS800 4000-Lumen Pixel-Shift 4K UHD Ultra-Short Throw Laser 3LCD Smart Home Theater Projector (Black) - Manual (Page 105)

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9. Place the air filter back in the projector with the four tabs facing down as shown.
Caution: Do not try to force the air filter cover closed if the tabs of the air filter are facing up. You
could damage the projector.
10. Insert the air filter cover and then push it up until it clicks into place.
11. Replace the front cover.
Parent topic: Air Filter and Vent Maintenance
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