NEC LT240 - Ceiling Mount Installation

NEC Solutions (America), Inc.
Visual Systems
LT240 Installation Guide
Desktop and Ceiling Mount v3.0
www.necvisualsystems.com Page 2 of 7
Projection Distance and Screen Size for Ceiling Mount
The following shows the proper relative position of the projector and screen. Refer to the table for installation data.
Distances are in inches. For millimeters multiply by 25.4.
Ceiling Mount Installation
Throw Distance
D
Screen Top
B
α
Screen Ctr
Lens Ctr
2.9"
Lens Offset from
Mount Center
7.6"
*7.2" pipe base
C
*5.6" flush base
*See page 6 for mount base info
Distance Chart
BD
Diagonal Width(H) Height(V) wide - tele wide - tele
inches inches inches inches inches
30 24 18 12.6 35.7 - 43.4 3.6 19.4 - 16.2
40 32 24 16.8 48.2 - 58.4 4.8 19.2 - 16.0
60 48 36 25.2 73.2 - 88.5 7.2 19.0 - 15.9
67 53.6 40.2 28.1 81.9 - 99.0 8.0 19.0 - 15.9
72 57.6 43.2 30.2 88.1 - 106.5 8.6 18.9 - 15.8
84 67.2 50.4 35.3 103.1 - 124.6 10.1 18.9 - 15.8
90 72 54 37.8 110.6 - 133.6 10.8 18.9 - 15.8
100 80 60 42.0 123.1 - 148.6 12.0 18.8 - 15.8
120 96 72 50.4 148.1 - 178.7 14.4 18.8 - 15.8
150 120 90 63.0 185.5 - 223.8 18.0 18.8 - 15.7
180 144 108 75.6 223.0 - 268.9 21.6 18.7 - 15.7
210 168 126 88.2 260.4 314.0 25.2 18.7 15.7
240 192 144 100.8 297.9 359.1 28.8 18.7 15.7
270 216 162 113.4 335.4 404.1 32.4 18.7 15.7
300 240 180 126.1 372.8 449.2 36.1 18.7 15.7
350 280 210 147.1 435.2 524.4 42.1 18.7 15.7
400 320 240 168.1 497.7 599.6 48.1 18.7 15.7
450 360 270 189.1 560.1 674.7 54.1 18.7 15.7
500 400 300 210.1 622.5 - 749.9 60.1 18.6 - 15.7
Screen Size (4:3) C
inches
α
degrees
Note: For screen sizes not indicated on the projection tables, use the formulas on page 1.