Engineering Bulletin
Engineering Data
Engineering Data
128
TG Transfer Grilles (Page 57)
* Average Face Velocity
200
300
400
500
600
700
800
8x8
Ak .44
cfm
PL
90
.08
130
.17
180
.30
220
.47
265
.68
310
.93
350
1.20
14x6
Ak .55
cfm
PL
110
.07
165
.16
220
.30
275
.46
330
.65
385
.90
440
1.20
12x8
Ak .64
cfm
PL
130
07
190
.16
255
.29
320
.45
385
.64
450
.88
510
1.10
14x8
Ak .74
cfm
PL
150
.07
220
.16
295
.28
370
.44
445
.63
520
.87
590
1.10
20x6
Ak .78
cfm
PL
155
.07
235
.16
310
.28
390
.44
470
.62
545
.86
625
1.10
12x12
Ak .93
cfm
PL
185
.07
280
.15
370
.27
465
.43
560
.61
650
.84
745
1.10
30x6
Ak 1.12
cfm
PL
225
.07
335
.15
450
.26
560
.42
670
.60
785
.82
895
1.10
16x12
Ak 1.19
cfm
PL
240
.07
360
.15
475
.26
595
.41
715
.59
835
.81
950
1.10
18x12
Ak 1.33
cfm
PL
265
.07
400
.15
530
.26
665
.41
800
.58
930
.88
1065
1.00
20x12
Ak 1.46
cfm
PL
290
.06
440
.15
585
.26
730
.40
875
.58
1020
.79
1170
1.00
16x16
Ak 1.54
cfm
PL
310
.06
460
.14
615
.25
770
.40
925
.57
1080
.78
1230
1.00
24x12
Ak 1.75
cfm
PL
350
.06
525
.14
700
.25
875
.39
1050
.56
1225
.77
1400
1.00
18x18
Ak 1.95
cfm
PL
390
.06
585
.14
780
.25
975
.39
1170
.55
1365
.76
1560
.99
30x12
Ak 2.17
cfm
PL
435
.06
650
.14
870
.25
1085
.38
1300
.54
1520
.75
1740
.98
20x20
Ak 2.42
cfm
PL
485
.06
730
.14
970
.24
1210
.38
1450
.54
1690
.74
1940
.97
24x18
Ak 2.55
cfm
PL
510
.06
765
.14
1020
.24
1275
.37
1530
.53
1785
.73
2040
.96
30x18
Ak 3.23
cfm
PL
650
.06
970
.13
1290
.23
1620
.36
1940
.51
2260
.71
2580
.93
24x24
Ak 3.40
cfm
PL
680
.06
1020
.13
1360
.23
1700
.36
2040
.51
2380
.70
2720
.92
30x24
Ak 4.18
cfm
PL
840
.06
1250
.13
1670
.22
2090
.35
2510
.50
2930
.68
3340
.89
30x30
Ak 5.15
cfm
PL
1030
.05
1550
.12
2060
.22
2580
.34
3090
.48
3610
.66
4120
.86
* Velocity measured 1” from face.
20 Round Diffuser (Page 59)
Face Velocity
500
600
700
800
900
1000
1200
1400
1600
1800
6”
Ak .16
cfm
Ps
Throw
80
<.01
2
95
<.01
2.5
110
<.01
3
130
.014
3.5
145
.016
4.5
160
.020
5
190
.027
6
225
.038
7
255
.049
8
290
.062
9
8”
Ak .28
cfm
Ps
Throw
140
<.01
3.5
170
<.01
4
195
<.01
4.5
225
.013
5
250
.016
5.5
280
.020
6.5
335
.028
7.5
390
.038
9
450
.050
10.5
505
.063
12
10”
Ak .44
cfm
Ps
Throw
220
<.01
4
265
<.01
4.5
310
.010
5
350
.013
6
395
.016
7
440
.020
8
530
.029
9
615
.041
11
705
.051
13
790
.065
14
12”
Ak .66
cfm
Ps
Throw
330
<.01
5
395
<.01
6
460
.010
7
530
.013
8
595
.017
9
660
.021
10
790
.029
12
925
.040
14
1025
.050
16
1190
.063
18
14”
Ak .91
cfm
Ps
Throw
455
<.01
6
545
<.01
7
640
.011
8
730
.014
9
820
.017
10.5
910
.021
12
1090
.030
14
1275
.040
16
1455
.053
18
1640
.067
21
16”
Ak 1.20
cfm
Ps
Throw
600
<.01
7
720
<.01
8
840
.010
9
960
.013
10.5
1080
.016
12
1200
.020
13.5
1440
.028
16
1680
.039
19
1920
.050
22
2160
.063
24
18”
Ak 1.50
cfm
Ps
Throw
750
<.01
8
900
<.01
9
1050
.010
10
1200
.013
12
1350
.017
13.5
1500
.021
15
1800
.030
18
2100
.040
21
2400
.052
24
2700
.062
27
NOTE: The use of a balancing hood is recommended to balance the system.
Ak = Effective Area in square feet
Ps = Static Pressure Loss in inches of water
NC = Noise Criteria, based on a 10dB room attenuation (Re: 10
-12
watts) ASHRAE 36-72.
Terminal Velocity of 100 fpm
Product tested with core in “out” position.
When diffusers are used on an exposed duct, multiply throw by 0.7
NC < 35 NC > 35
RE5 Series Return Air Registers and Grilles
(Page 53)
400 500 600 700 800 900 1000
6
x
6 CFM 30 37 44 52 59 67 74
Ak 0.07 Ps 0.010 0.013 0.018 0.023 0.030 0.038 0.049
8
x
8 CFM 87 108 130 152 174 195 217
Ak 0.22 Ps 0.010 0.013 0.018 0.023 0.031 0.039 0.049
10
x
10 CFM 160 200 240 280 320 360 400
Ak 0.40 Ps 0.010 0.014 0.018 0.024 0.031 0.040 0.050
12
x
6 CFM 103 129 155 180 206 232 258
Ak 0.26 Ps 0.010 0.014 0.018 0.024 0.031 0.039 0.049
14
x
6 CFM 127 159 191 223 255 287 319
Ak 0.32 Ps 0.010 0.014 0.018 0.024 0.031 0.040 0.050
14
x
8 CFM 184 230 276 322 368 414 460
Ak 0.46 Ps 0.011 0.014 0.018 0.024 0.032 0.040 0.050
12
x
12 CFM 249 311 373 435 497 559 622
Ak 0.62 Ps 0.011 0.014 0.018 0.025 0.032 0.041 0.051
24
x
8 CFM 345 431 517 603 689 775 862
Ak 0.86 Ps 0.011 0.014 0.019 0.025 0.032 0.041 0.052
18
x
12 CFM 392 490 589 687 785 883 981
Ak 0.98 Ps 0.012 0.014 0.019 0.025 0.033 0.041 0.052
30
x
8 CFM 440 550 660 770 880 990 1100
Ak 1.10 Ps 0.012 0.015 0.019 0.025 0.033 0.042 0.052
24
x
12 CFM 534 668 801 935 1068 1202 1336
Ak 1.34 Ps 0.012 0.015 0.019 0.026 0.033 0.042 0.053
18
x
18 CFM 604 756 907 1058 1209 1360 1511
Ak 1.51 Ps 0.013 0.015 0.019 0.026 0.033 0.042 0.054
30
x
12 CFM 674 843 1011 1180 1348 1517 1685
Ak 1.69 Ps 0.013 0.015 0.019 0.026 0.034 0.042 0.054
20
x
20 CFM 751 939 1127 1315 1502 1690 1878
Ak 1.88 Ps 0.013 0.015 0.019 0.026 0.034 0.043 0.055
36
x
12 CFM 812 1015 1218 1422 1625 1828 2031
Ak 2.03 Ps 0.014 0.015 0.019 0.026 0.034 0.043 0.055
24
x
20 CFM 903 1129 1355 1581 1807 2033 2258
Ak 2.26 Ps 0.014 0.016 0.019 0.026 0.034 0.043 0.055
30
x
18 CFM 1016 1270 1524 1778 2032 2286 2540
Ak 2.54 Ps 0.014 0.016 0.020 0.027 0.034 0.043 0.056
24
x
24 CFM 1083 1354 1625 1895 2166 2437 2708
Ak 2.71 Ps 0.014 0.016 0.020 0.027 0.034 0.043 0.056
36
x
18 CFM 1216 1519 1823 2127 2431 2735 3039
Ak 3.04 Ps 0.014 0.016 0.020 0.027 0.035 0.043 0.056
30
x
24 CFM 1346 1683 2019 2356 2692 3029 3366
Ak 3.37 Ps 0.015 0.016 0.020 0.027 0.035 0.044 0.057
36
x
24 CFM 1602 2003 2403 2804 3204 3605 4005
Ak 4.01 Ps 0.014 0.016 0.020 0.027 0.035 0.044 0.057
30
x
30 CFM 1665 2081 2497 2913 3330 3746 4162
Ak 4.16 Ps 0.014 0.016 0.020 0.027 0.035 0.044 0.057
36
x
30 CFM 1972 2465 2958 3451 3944 4437 4929
Ak 4.93 Ps 0.014 0.016 0.021 0.028 0.035 0.044 0.056
48
x
24 CFM 2091 2614 3137 3660 4183 4705 5228
Ak 5.23 Ps 0.013 0.016 0.021 0.028 0.036 0.045 0.055
36
x
36 CFM 2325 2906 3487 4068 4650 5231 5812
Ak 5.81 Ps 0.012 0.016 0.021 0.028 0.036 0.045 0.053
48
x
36 CFM 2981 3726 4471 5216 5961 6706 7452
Ak 7.45 Ps 0.012 0.013 0.021 0.028 0.036 0.045 0.044
48
x
48 CFM 3751 4689 5626 6564 7502 8439 9377
Ak 9.38 Ps 0.012 0.013 0.021 0.029 0.037 0.046 0.044
Average Face Velocity
Average Face Velocity