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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