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Ceiling Installation
F
B
A: Distance between the lens and the screen center
B: Vertical distance between the top of the supplied ceiling mount and the screen center
C: Horizontal throw distance between screen surface and the lens
F: Vertical distance between projector base and top of image
Zoom Lens (Wide)
α
degree
9.01
β (=sinα)
0.16
γ (=cosα)
0.99
Screen Size H-Width
inch
24
4:3 Diagonal
inch
30
A
mm
1171
inch
46
C
mm
1156
inch
46
B
mm
277
inch
11
F
mm
-46
inch
Zoom Lens (Tele)
α
degree
6.28
β (=sinα)
0.11
γ (=cosα)
0.99
Screen Size H-Width
inch
20
4:3 Diagonal
inch
25
A
mm
1396
inch
55
C
mm
1387
inch
55
B
mm
247
inch
10
F
mm
-54
inch
WARNING
• Installing your projector on the ceiling must be done by a quali-
fied technician. Contact your NEC dealer for more informa-
tion.
* Do not attempt to install the projector yourself.
• Only use your projector on a solid, level surface. If the projec-
tor falls to the ground, you can be injured and the projector
severely damaged.
• Do not use the projector where temperatures vary greatly. The
projector must be used at temperatures between 32˚F (0˚C)
and 95˚F (35˚C).
• Do not expose the projector to moisture, dust, or smoke. This
will harm the screen image.
• Ensure that you have adequate ventilation around your pro-
jector so heat can dissipate. Do not cover the vents on the side
or the front of the projector.
α
A
C
8.93
8.85
8.82
8.81
0.16
0.15
0.15
0.15
0.99
0.99
0.99
0.99
32
48
56
40
60
70
1471
2242
2628
3013
58
88
103
1452
2214
2595
2976
57
87
102
338
461
522
13
18
21
-29
3
19
-2
-1
0
1
7.1
7.0
7.0
0.12
0.12
0.12
0.12
0.99
0.99
0.99
0.99
32
48
56
40
60
70
1902
2900
3399
3898
75
114
134
1887
2878
3373
3869
74
113
133
338
461
522
13
18
21
-29
3
19
-2
-1
0
1
Formulas(mm)
H" = Horizontal Screen Width (inch)
A = C/cosα
B = 94 + 5.5 × M
C (wide) = 36.8712 × (diagonal screen size/ 0.92205) – 43.5689
C (tele) = C(wide) × 1.2
F = 1.4516 × M – 94
M = 1.25H" / 22.86
Formulas(inch)
H" = Horizontal Screen Width
A = C/cosα
B = (T.B.D. +5.5 × M) / 25.4
C (wide) = (36.8712 × (diagonal screen size/0.92205) – 43.5689) / 25.4
C (tele) = C (wide) × 1.2
F = 1.4516 × M – 94/25.4
M = 1.25H / 0.9
8.79
8.78
8.77
0.15
0.15
0.15
0.99
0.99
0.99
64
72
80
96
80
90
100
120
3399
3785
4556
119
134
149
179
3357
3738
4500
117
132
147
177
583
644
705
827
23
25
28
33
35
51
67
100
1
2
3
4
7.0
7.0
6.9
6.9
0.12
0.12
0.12
0.99
0.99
0.99
64
72
80
96
80
90
100
120
4397
4896
5893
153
173
193
232
4364
4860
5851
152
172
191
230
583
644
705
827
23
25
28
33
35
51
67
100
1
2
3
4
If your projector is mounted on the ceiling and your image is upside
down, use the "Menu" and "Select" buttons on your projector cabi-
net or
button on your remote control to correct the orientation.
(See page E-31.)
Reflecting the Image
Using a mirror to reflect your projector's image enables you to enjoy
a much larger image. Contact your NEC dealer if you need a mirror.
If you're using a mirror and your image is inverted, use the "Menu"
and "Select" buttons on your projector cabinet or
your remote control to correct the orientation. (See page E-31.)
E–16
8.75
8.74
8.74
8.73
0.15
0.15
0.15
0.15
0.99
0.99
0.99
0.99
120
144
160
192
150
180
200
240
5713
6870
7641
9184
225
270
301
362
5644
6787
7549
9074
222
267
297
357
1011
1194
1316
1561
40
47
52
61
148
196
229
293
6
8
9
12
6.9
6.9
6.9
6.9
0.12
0.12
0.12
0.12
0.99
0.99
0.99
0.99
120
144
160
192
150
180
200
240
7390
8887
9885
11881
291
350
389
468
7337
8823
9814
11796
289
347
386
464
1011
1194
1316
1561
40
47
52
61
148
196
229
293
6
8
9
12
8.72
8.72
0.15
0.15
0.99
0.99
216
240
270
300
10341
11498
407
453
10217
11360
402
447
1744
1927
69
76
341
390
13
15
6.9
6.9
0.12
0.12
0.99
0.99
216
240
270
300
13378
14875
527
586
13282
14768
523
581
1744
1927
69
76
341
390
13
15
buttons on
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