Engineering Bulletin

Engineering Data
153
Neck Velocity 300 400 500 600 700 800 900 1000 1200
6" Dia. cfm 60 80 100 120 140 160 180 200 235
Ak .20 Ps .005 .009 .015 .021 .027 .037 .047 .058 .080
NC x x x x 21 26 32 34 39
Throw 1.5 2 2.5 3 3.5 4 4.5 5.5 6.5
8" Dia. cfm 105 140 175 210 245 280 315 350 420
Ak .35 Ps .007 .012 .019 .027 .037 .049 .060 .074 .110
NC x x x x 22 28 33 36 41
Throw 2.5 3.5 4.5 5.5 6.5 7 8 9 10.5
10" Dia. cfm 165 220 270 325 380 435 490 545 655
Ak .54 Ps .008 .015 .023 .033 .046 .060 .076 .093 .135
NC x x x 22 27 32 36 39 43
Throw 3.5 4.5 5.5 6.5 7.5 8.5 9.5 11 13
12" Dia. cfm 235 315 390 470 550 630 705 785 945
Ak .78 Ps .010 .018 .027 .039 .053 .070 .088 .110 .160
NC x x x 20 27 35 38 41 45
Throw 3.5 5 6 7.5 8.5 10 11 12.5 15
14" Dia. cfm 320 430 535 640 750 855 960 1070 1285
Ak 1.07 Ps .011 .020 .031 .045 .060 .080 .105 .125 .180
NC x x x 25 31 34 39 43 49
Throw 4 5.5 7 8.5 10 11 12.5 14 16.5
RFPS (Page 94)
NC is based on 10db room absorption (Re: 10 -
12
watts).
X indicates NC less than 20. Throw in feet measured at a terminal velocity of 100 FPM. The change in throw
due to pattern selection is not significant. Measurements were made an Alnor Thermo-Anemometer model 8565.
800
155
.048
24
11
9.5
7
280
.077
27
14.5
13.5
10
435
.100
33
22
19.5
14
630
.113
32
25
22
16.5
855
.145
36
29
26
19
900
17 5
.062
28
13
10.5
7.5
315
.097
31
16
14.5
11.5
490
.125
37
25
22
15.5
705
.140
35
27
25
18
960
.180
40
32
28
21
600
120
.029
20
8
7
5
210
.043
20
11.5
10.5
7.5
325
.056
21
16.5
14.5
10.5
470
.068
20
19.5
17. 5
12
640
.082
26
22.5
20
14.4
500
100
.020
x
7
6
4.5
17 5
.030
x
10
8.5
6.5
275
.040
x
14
12.5
8.5
395
.045
x
16.5
14.5
10
535
.057
20
19
17
12
400
80
.013
x
6
4.5
3.5
140
.019
x
8
7
5
220
.026
x
11
10
7
315
.029
x
13
11.5
8
430
.037
x
15
13.5
10
PDSD (Page 95)
Neck Velocity
cfm
Ps
NC
1 Way Throw
2-3 Way Throw
4 Way Throw
cfm
Ps
NC
1 Way Throw
2-3 Way Throw
4 Way Throw
cfm
Ps
NC
1 Way Throw
2-3 Way Throw
4 Way Throw
cfm
Ps
NC
1 Way Throw
2-3 Way Throw
4 Way Throw
cfm
Ps
NC
1 Way Throw
2-3 Way Throw
4 Way Throw
6" Dia.
An .20
8" Dia.
An .35
10" Dia.
An .54
12" Dia.
An .78
14" Dia.
An 1.07
12 00
235
.110
37
16
13
9
420
.173
40
21
19
14
655
.225
45
30
27
20
940
.250
44
34
30
23
1285
.320
49
39
35
27
1000
195
.076
33
14
11.5
8
350
.120
35
18
16
12.5
545
.115
40
27
24
17
785
.170
38
30
27
20
1070
.225
44
35
31
23
700
135
.037
21
10
8
6
245
.059
22
13
12
9
380
.076
27
19
17
12
550
.086
25
22
20
14
750
.112
31
26
23
17
300
60
.007
x
4
3.5
2.5
105
.011
x
6
5
4
165
.015
x
8.5
7.5
5
235
.016
x
10
8.5
6
320
.021
x
11
10
7
Note: The use of a balancing hood is recommended to balance the system.
NC is based on 10 db room attenuation (Re: 10 -
12
watts) ASHRAE 36-72. X=less than 20.
Terminal velocity of 75 fpm.
600
120
.027
210
.037
325
.043
470
.046
640
.050
840
.070
1060
.070
2200
.070
400
80
.012
140
.017
220
.020
315
.021
430
.023
560
.031
705
.031
1470
.032
300
60
.007
105
.010
165
.011
235
.012
320
.013
420
.018
530
.018
110 0
.018
200
40
.003
70
.004
110
.005
155
.005
215
.006
280
.008
355
.008
735
.008
PD,PDR, RFPR, RENP
(Page 90, 94, 95)
Neck Velocity, FPM
cfm
-Ps
cfm
-Ps
cfm
-Ps
cfm
-Ps
cfm
-Ps
cfm
-Ps
cfm
-Ps
cfm
-Ps
6" Dia.
8" Dia.
10" Dia.
12" Dia.
14" Dia.
16" Dia.
18" Dia.
24 x 24
800
155
.044
380
.068
435
.076
630
.083
855
.090
1115
.120
1415
.125
2935
.130
700
135
.034
245
.051
380
.058
550
.063
750
.069
975
.094
1235
.092
2570
.095
500
100
.019
17 5
.026
275
.030
395
.033
535
.035
700
.048
885
.049
1835
.050