GB-200-5
(512-770)
GB-180-7
(764-1055)
GB-180-5
(700-940)
0.000
0.125
0.250
0.375
0.500
0.625
0.750
0.875
1.000
Sone Bhp Sone Bhp Sone Bhp Sone
Bhp Sone
Bhp Sone
Bhp Sone
Bhp Sone
Bhp Sone
Bhp
STATIC PRESSURE / CAPACITY
Preliminary Selections
At this point we know the model, cfm and Ps. With this
information we can refer to the GB performance charts
to determine the sizes available to move 2400 cfm
against 0.50 in. Ps.
In our case, all of the criteria can be met by more than
one size of a particular model. When this occurs,
choose the size that provides the greatest airflow range
about the desired cfm. For example, many direct drive
fans have three speeds. If possible, choose a size that
uses the middle rpm. This will allow some final system
adjustment if the actual cfm the job requires is
somewhat higher or lower once the fan is installed. Belt
driven fans have adjustable motor pulleys which allow
the fan speed to be varied. With belt drive units, avoid
selecting near the maximum rpm of a size to allow for
final adjustments if necessary.
There are four GB sizes to choose from in the QD
catalog. These sizes along with their performance data
are in the table below.
Stability Considerations
Whenever there is more than one size to choose from,
it is not recommended to select from the performance
box in the far right column for any given rpm unless the
Ps is known to be accurate. For example, the GB-200
selection (see table below) of 2493 cfm at 0.50 in. Ps is
the far right selection at 700 rpm.
The next box to the right (0.625 in. Ps) is empty
because the performance at that point is unstable. This
means that 2494 cfm at 0.50 in. is marginally stable.
For more information on fan stability, contact
Greenheck.
2522
2433
2346
2258
2166
2062
1942
1792
1602
14.6
0.48
14.3
0.50
13.9
0.51
13.5
0.52
13.1
0.52
12.7
0.52
12.2
0.53
11.6
0.52
11.0
0.51
2866
2787
2709
2634
2556
2475
2384
2286
2176
17.6
0.71
18.0
0.72
17.4
0.74
17.1
0.75
16.8
0.76
15.9
0.77
14.9
0.77
14.8
0.77
14.7
0.78
2318
2104
1875
1587
8.9
0.18
8.5
0.19
8.3
0.19
7.8
0.19
2555
2359
2162
1932
1624
10.6
0.24
10.1
0.25
9.7
0.26
9.4
0.26
8.8
0.25
2909
2737
2567
2382
2176
1914
1550
13.4
0.35
12.7
0.36
12.3
0.37
11.9
0.38
11.5
0.38
10.9
0.37
10.2
0.35
3249
3094
2943
2786
2614
2428
2197
1899
15.3
0.48
14.7
0.50
14.1
0.52
13.8
0.53
13.5
0.53
13.0
0.53
12.5
0.52
12.0
0.50
2994
2833
2651
2427
2139
1700
8.1
0.25
9.2
0.26
9.1
0.29
8.5
0.30
7.8
0.30
7.4
0.28
3150
2997
2832
2624
2375
2053
10.6
0.29
10.3
0.31
10.0
0.33
9.3
0.35
8.6
0.35
8.2
0.34
3500
3364
3219
3052
2858
2624
2347
1821
12.7
0.40
12.4
0.42
12.1
0.44
11.3
0.46
10.5
0.48
10.2
0.48
9.8
0.47
9.2
0.43
3655
3527
3388
3234
3052
2844
2601
2272
13.6
0.46
13.4
0.47
13.1
0.49
12.3
0.52
11.4
0.54
11.0
0.55
10.6
0.54
10.1
0.52
3888
3768
3638
3504
3339
3164
2952
2712
2387
15.2
0.55
14.7
0.57
13.7
0.58
13.3
0.62
13.0
0.64
12.4
0.66
11.9
0.66
11.6
0.65
11.1
0.63
4102
3989
3866
3741
3596
3432
3251
3050
2811
16.2
0.65
15.7
0.67
14.9
0.68
14.4
0.72
14.0
0.74
13.5
0.76
12.9
0.77
12.7
0.77
12.4
0.77
4607
4507
4400
4290
4179
4045
3900
3753
3575
19.0
0.91
18.4
0.94
17.8
0.96
17.4
0.98
17.1
1.03
16.7
1.05
16.2
1.07
15.8
1.10
15.4
1.10
5191
5102
5010
4912
4814
4715
4599
4474
4343
22.0
1.31
22.0
1.33
21.0
1.36
21.0
1.37
21.0
1.41
20.0
1.47
19.9
1.49
19.5
1.51
19.2
1.54
5677
5595
5514
5424
5335
5245
5155
5049
4938
26.0
1.71
25.0
1.74
24.0
1.77
24.0
1.79
24.0
1.81
24.0
1.86
23.0
1.93
23.0
1.95
23.0
1.97
3873
3591
3307
2973
2493
10.3
0.39
9.6
0.40
9.2
0.41
8.6
0.41
7.8
0.40
4260
4013
3744
3477
3140
2643
12.1
0.52
11.0
0.53
10.7
0.55
10.2
0.55
9.8
0.55
9.3
0.52
MODEL
(rpm RANGE)
RPM
Tip
Speed
1360
5207
1545
5915
785
3416
865
3764
985
4287
1100
4787
770
3729
810
3923
900
4359
940
4553
1000
4843
1055
5109
1185
5739
1335
6465
1460
7071
700
3917
770
4308
hp
GB-141
GB-141-5
(1125-1360)
GB-161-4
(634-865)
GB-161-5
(852-1100)
1/2
3/4
1/4
1/2
GB-180-3
(618-810)
GB-180
1/3
1/2
3/4
2
1/2
1
1
/
2
1
Model and Performance Box Data
CFM
Sones
Bhp
RPM
Size
GB-141
2556
16.8
.76
1545
GB-161
2614
13.5
.53
1100
GB-180
2375
8.6
.35
810
GB-200
2493
7.8
.40
700
18
