Sony Video Projector VPL-VW90ES - Manual (Page 93)

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Ceiling Installation
Use the PSS-H10 Projector Suspension Support when you install the projector on a
ceiling. The projection distances for ceiling installation are shown below.
L’:Distance between the screen and the installation hole at the
ceiling side of the ceiling mount unit (front side)
y’: Distance between the ceiling and the center of the screen such
that the picture will not be truncated or blocked
PSS-H10 Projector Suspension
Support (not supplied)
Ceiling
Center of the screen