NEC
Solutions
(America),
Inc.
Visual Systems
LT220 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
C
Throw Distance
D
Screen Top
B
α
Screen Ctr
Lens Ctr
2.9"
Lens Offset from
6.8"
*7.2" pipe base
*5.6" flush base
Mount Center
*See page 6 for mount base info
Distance Chart
B
D
Diagonal
Width(H)
Height(V)
wide - tele
wide - tele
inches
inches
inches
inches
inches
30
24
18
13.0
48.0 - 59.0
4.0
15.2 - 12.4
40
32
24
17.3
64.5 - 79.0
5.3
15.0 - 12.4
60
48
36
26.0
97.6 - 119.0
8.0
14.9 - 12.3
67
53.6
40.2
29.0
109.1 - 133.0
8.9
14.9 - 12.3
72
57.6
43.2
31.2
117.4 - 143.0
9.6
14.9 - 12.3
84
67.2
50.4
36.4
137.2 - 167.0
11.2
14.9 - 12.3
90
72
54
39.0
147.1 - 179.0
12.0
14.9 - 12.3
100
80
60
43.4
163.7 - 199.0
13.4
14.8 - 12.3
120
96
72
52.0
196.7 - 239.0
16.0
14.8 - 12.3
150
120
90
65.0
246.3 - 299.0
20.0
14.8 - 12.3
180
144
108
78.1
295.9 - 359.0
24.1
14.8 - 12.3
210
168
126
91.1
345.4
419.0
28.1
14.8
12.3
240
192
144
104.1
395.0
479.0
32.1
14.8
12.3
270
216
162
117.1
444.6
539.0
36.1
14.8
12.3
300
240
180
130.1
494.2
599.0
40.1
14.7
12.3
350
280
210
151.8
576.8
699.0
46.8
14.7
12.3
400
320
240
173.5
659.4
799.0
53.5
14.7
12.2
450
360
270
195.1
742.0
899.0
60.1
14.7
12.2
500
400
300
216.8
824.7 - 999.0
66.8
14.7 - 12.2
Screen Size (4:3)
C
inches
α
degrees
Note:
For screen sizes not indicated on the projection tables, use the formulas on page 1.
