Reading Performance Charts - Greenheck 240XP-CUB Manual

The most important part of selecting a fan is the ability
to read the performance charts. Most of the
performance charts in the catalog are similar and are
read in the same manner. Models RSF and BCF are
Assume that a job requires a belt drive roof exhauster
to move 1000 cfm against 0.25 in. Ps. Refer to the
performance model at the bottom of this page. Start at
the top of the chart with the 0.25 in. Ps column. (All
numbers in this column correspond to .25 in. Ps.) Now
follow the column downward until a value is found that
slightly exceeds 1000 cfm. In this case, 1012 cfm is the
first box that meets the requirements.
Note: Notice that each performance box is divided into
3 smaller boxes. The numbers refer to cfm, Sones and
Bhp.
Example:
CFM
Sone Bhp
At this performance point, the sone value is 11.1 and
the fan Bhp required is 0.16. Now by following the row
to the left, we can determine fan rpm and fan model.
In this case, the fan rpm is 1510 and the model is
GB-090-4 which has a 1/4 hp motor.
Notice that the GB-090-4 is not the only model to
choose from. If we follow the 0.250 in. Ps column down
further, we find a performance point at 1010 cfm.
Table 2
MODEL
hp RPM
(rpm RANGE)
1360
GB-090-4 1/4
1510
(1290-1710)
1710
1070
GB-101-4-R1
1/4
(1020-1400)
1355
1260
GB-101-4-R2
1/4
(1260-1635)
1635
GB-101-3 1/3
1800

Reading Performance Charts

Belt Drive Selection
1012
11.1 0.16
TS
0.000 0.125
Sone Bhp Sone Bhp Sone Bhp Sone Bhp Sone Bhp Sone Bhp Sone Bhp Sone Bhp Sone Bhp
1030 957
3983
10.1 0.11 9.9 0.12 9.6
1144 1078
4422
11.4 0.15 11.2 0.16 11.1
1295 1237
5008
13.4 0.22 13.3 0.23 13.2
906 818
3116
6.0 0.060 5.4 0.065 5.0
1148 1077
3946
8.5 0.12 8.1 0.13 7.9
1067 991
3669
7.6 0.099 7.1 0.104 6.8
1385 1325
4761
11.1 0.22 10.8 0.22 10.4
1525 1471
5242
13.2 0.29 12.8 0.30 12.5
exceptions to this rule. The selection procedure for
these models is handled separately. Direct drive and
belt drive fans are also addressed separately.
At this point, the sone value is 7.9 and the Bhp is 0.14.
Following across to the left we find the rpm to be 1355.
The model is GB-101-4-R1, which also has a 1/4 hp
motor.
Both the GB-090-4 and the GB-101-4-R1 will perform
the air movement task equally as well. However, the
sound generated by the fan may have to be
considered. Compare the sone values: 7.9 sones for the
GB-101 and 11.1 for the GB-090. The GB-101 is about
30% quieter. Where a low sound fan is required, the
GB-101 would be a better selection. If loudness is not a
factor, the GB-090 would be a better selection because
it is less expensive.
Another possibility for this particular selection is a
GB-100-4-R2. Even though there is no performance
box showing close to 1000 cfm, there are two
performance boxes that bracket 1000 cfm. At 921 cfm
the fan will be running at 1260 rpm. At 1269 cfm the fan
will be running at 1635 rpm. Therefore, there is an rpm
for this model that will correspond to 1000 cfm
(obviously somewhere within the 1260-1635 rpm
range). As with all Greenheck belt drive fans,
intermediate cfm values are easily achieved by
adjusting the motor pulley (see illustration on next
page).
STATIC PRESSURE / CAPACITY
0.250 0.375 0.500
884 807 725
0.12 9.3 0.12 8.8 0.13
1012 946 875
0.16 10.7 0.17 10.4 0.17 10.0
1179 1121 1061
0.23 13.0 0.24 12.7 0.24 12.4
731 607
0.070 4.3 0.070
1010 943 856
0.14 7.8 0.14 7.2 0.14
921 840 735
0.112 6.5 0.115 5.9 0.115 4.4
1269 1214 1161
0.23 10.2 0.24 9.8 0.25
1418 1367 1320
0.30 12.3 0.31 12.2 0.33 11.3
0.625 0.750 0.875
632
8.5 0.13
800 720 607
0.17 9.8 0.17 9.5 0.17
999 934 866
0.25 12.1 0.25 11.8 0.25 11.6
739
6.8 0.14
385
0.083
1094 1019 928
9.3 0.25 8.9 0.25 8.4 0.25
1270 1208 1141
0.33 10.8 0.33 10.6 0.33 10.1
1.000
785
0.25
792
7.8 0.24
1064
0.33
5