NEC VT46 Installation Manual page 2

Ceiling Mounted Installation
The following diagram shows the relationship between projector position and the screen. Refer to the chart below for data.
Distances are in inches. For millimeters multiply by 25.4.
Screen Top
D
Lens Ctr
B
Screen Ctr
Distance Chart
(for popular screen sizes)
Diagonal
inches
21
40
60
67
72
84
90
100
120
150
180
210
240
270
300
Note: For screen sizes not indicated on the chart, use the formulas on page 1.
www.necvisualsystems.com
*See page 6 for mount details
Screen Size (4:3)
Width(H) Height(V)
inches inches
16.8 12.6
32 24
48 36
53.6 40.2
57.6 43.2
67.2 50.4
72 54
80 60
96 72
120 90
144 108
168 126
192 144
216 162
240 180
C
Throw Distance
*6.5" w/pipe connector
*5.6" w/ceiling plate
C
B
wide - tele
inches
inches
5.1 NA - 28.9
9.7 47.2 - 56.6
14.5 71.4 - 85.7
16.2 79.9 - 95.9
17.4 86.0 - 103.2
20.3 100.6 - 120.7
21.8 107.8 - 129.4
24.2 120.0 - 143.9
29.0 144.2 - 173.1
36.3 180.6 - 216.7
43.5 217.0 - 260.4
50.8 253.4 - 304.1
58.0 289.8 - 347.8
65.3 326.2 - 391.4
72.6 362.6 - 435.1
4.9"
α
Lens Offset from
Mount Pipe
2.8"
α
D
wide - tele
degrees
inches
1.2 NA - 10.0
2.3 11.6 - 9.7
3.5 11.5 - 9.6
3.9 11.5 - 9.6
4.2 11.4 - 9.6
4.9 11.4 - 9.6
5.2 11.4 - 9.5
5.8 11.4 - 9.5
7.0 11.4 - 9.5
8.7 11.4 - 9.5
10.5 11.3 - 9.5
12.2 11.3 - 9.5
14.0 11.3 - 9.5
15.7 11.3 - 9.5
17.4 11.3 - 9.5
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