Acer X138GWH User Manual page 61

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Ceiling Mount Installation
If you wish to install the projector using a ceiling mount, please refer to the
steps below:
1 Drill four holes into a solid, structural ceiling member, and secure the
ceiling mount base to the ceiling.
2 Choose the length combination based on actual environment. (CM-01S
doesn't include Type 2 and Type 3.)
Type 1 Type 2 Type 3