Acer H6540BD User Manual page 60

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3 Type 1:
For the standard size use three bracket screws to mount the projector to
the ceiling mount bracket.
Type 2 and Type 3:
Alternatively, for the larger size, use the sliding extensions for more
supports.
Type 1:
Note: It is recommended that you keep a reasonable space
between the bracket and the projector to allow for proper heat
distribution.
4 Connect the main body connector to the projector bracket (illustration 1),
and then screw up four screws (illustration 2).
Type 2:
Illustration 1
Type 3:
Illustration 2