Acer P7290 - Manual (Page 21)

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Installing the dust filter of the projector
This projector support dust proof function.
Follow these steps:
1 Take two dust filters from the
accessory bag.
2 Slide the dust filter in
(Illustration #1)
3 Insert a suitable coin into the
top cover release button
(Illustration #2) and rotate
clockwise (Illustration #3).
4 Open the top cover.
(Illustration #4)
5 Slide in another dust filter.
(Illustration #5)
6 Connect the power cord.
7 Turn on the projector by
pressing the power cord.
Caution:
1 The dust proof is optional function depend on users.
2 Once you decide to implement the dust proof function, please
ensure that both top and bottom dust filters are properly
installed. Otherwise there will be a warning sound and the
projector can not be turned on.