Ceiling Mount Installation - NEC LT240 Installation Manual

LT240 Installation Guide
Desktop and Ceiling Mount
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

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