Reading Performance Charts
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
exceptions to this rule. The selection procedure for these models is handled separately. Direct drive and belt drive fans are also addressed separately.
Belt Drive Selection
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:
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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
Notice that the
Table 2
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
Both the
Another possibility for this particular selection is a
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hp | RPM | TS | 0.000 | 0.125 | 0.250 | 0.375 | 0.500 | 0.625 | 0.750 | 0.875 | 1.000 | |||||||||||
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| Sone | Bhp | Sone | Bhp | Sone | Bhp | Sone | Bhp | Sone | Bhp | Sone | Bhp | Sone | Bhp | Sone | Bhp | Sone | Bhp | |
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| 1360 | 3983 | 1030 | 957 | 884 | 807 | 725 | 632 |
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| 10.1 | 0.11 | 9.9 | 0.12 | 9.6 | 0.12 | 9.3 | 0.12 | 8.8 | 0.13 | 8.5 | 0.13 |
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1/4 | 1510 | 4422 | 1144 | 1078 | 1012 | 946 | 875 | 800 | 720 | 607 |
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| 11.4 | 0.15 | 11.2 | 0.16 | 11.1 | 0.16 | 10.7 | 0.17 | 10.4 | 0.17 | 10.0 | 0.17 | 9.8 | 0.17 | 9.5 | 0.17 |
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| 1710 | 5008 | 1295 | 1237 | 1179 | 1121 | 1061 | 999 | 934 | 866 | 785 | |||||||||||
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| 13.4 | 0.22 | 13.3 | 0.23 | 13.2 | 0.23 | 13.0 | 0.24 | 12.7 | 0.24 | 12.4 | 0.25 | 12.1 | 0.25 | 11.8 | 0.25 | 11.6 | 0.25 | |
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| 1070 | 3116 | 906 | 818 | 731 | 607 |
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1/4 | 6.0 | 0.060 | 5.4 | 0.065 | 5.0 | 0.070 | 4.3 | 0.070 |
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1355 | 3946 | 1148 | 1077 | 1010 | 943 | 856 | 739 |
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| 8.5 | 0.12 | 8.1 | 0.13 | 7.9 | 0.14 | 7.8 | 0.14 | 7.2 | 0.14 | 6.8 | 0.14 |
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| 1260 | 3669 | 1067 | 991 | 921 | 840 | 735 | 385 |
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1/4 | 7.6 | 0.099 | 7.1 | 0.104 | 6.8 | 0.112 | 6.5 | 0.115 | 5.9 | 0.115 | 4.4 | 0.083 |
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1635 | 4761 | 1385 | 1325 | 1269 | 1214 | 1161 | 1094 | 1019 | 928 | 792 | ||||||||||||
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| 11.1 | 0.22 | 10.8 | 0.22 | 10.4 | 0.23 | 10.2 | 0.24 | 9.8 | 0.25 | 9.3 | 0.25 | 8.9 | 0.25 | 8.4 | 0.25 | 7.8 | 0.24 | |||
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1/3 | 1800 | 5242 | 1525 | 1471 | 1418 | 1367 | 1320 | 1270 | 1208 | 1141 | 1064 | |||||||||||
13.2 | 0.29 | 12.8 | 0.30 | 12.5 | 0.30 | 12.3 | 0.31 | 12.2 | 0.33 | 11.3 | 0.33 | 10.8 | 0.33 | 10.6 | 0.33 | 10.1 | 0.33 | |||||
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