NEC PX803UL-WH User Manual page 19

Attaching/Removing the Dust Cap
To remove the dust cap from the projector, push the
tongue at the top left outward and pull the knob at the
center of the cap.
To attach the dust cap to the projector, locate the catch on
the lower end of the dust cap and place it into the open-
ing of the projector with the point of a triangle mark (▽)
facing downward (① in the figure below), and then push
the upper end of the dust cap against the projector to
place the catches into the slot while clutching the handle
(② in the figure below).
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1. Introduction