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60 CLCH-SVX010A-EN
Constant K-Factors
The constant factor K is unique for each fan and is
primarily a function of the area and other geometric
properties of the fan inlet. Pre-engineered factors are
available from the factory for fan types where the airflow
measurement system is available.
Refer to unit submittals or Tab le 6 and Table 7 for
piezometer K-Factors for our most commonly used fans.
When a single transmitter is supplied in a multiple fan
system, one or more fans will be brought back to the
transmitter as a manifold and the airflow will represent the
total airflow for the system. As a result, the factor should
be adjusted as follows:
*
If a fan fails in a multiple fan system where only one
transmitter is being supplied, and if the remaining fans will
continue to be used, the factor should be reduced
accordingly. Additionally, if the inactive fan was included
in the manifold back to the transmitter, the tubes from the
inactive fan should be temporarily removed and replaced
with tubes from an active fan (or simply plugged).
When a transmitter is supplied for each fan, the factor does
not need to be adjusted. The resulting airflow will
represent single-fan airflow. At the controller level, the
individual airflows should be summed to get the total
Table 6. Constant K-Factor for Twin City Fans
Size
Model EPF/EPQ
Arrangement 1
Model EPFN/EPQN
Arrangement 4 Model BAE DWDI Model MPQN
122 911.46 944.92 793.96
150 1163.68 1206.40 1189.43
165 1464.80 1518.58 1439.60
182 1757.39 1821.92 3793.22 1821.92
200 2108.38 2185.80 4550.82 2185.80
222 2617.81 2713.93 5650.38 2713.93
245 3168.67 3285.02 6839.38 3285.02
270 3856.03 3997.61 8322.99 3997.61
300 4770.07 4945.21 10,295.89 4945.21
330 5757.23 5968.62 12,426.62 5968.62
365 7032.01 7290.21 15,178.15 7290.21
402 8555.41 8869.55 18,466.31 8869.55
445 10,444.42 10,827.92 22,543.63 10,827.92
490 12,669.80 13,135.01 27,346.98 13,135.01
542 15,541.11 16,111.75 33,544.50
600 19,004.71 19,702.52 41,020.47
660 22,994.79 23,839.12 49,632.82
730 28,128.04 29,160.84 60,712.61
807 74,233.52
890 90,279.75
982 110,113.94
Table 7. Constant K-Factors for Trane SDDP™ Fans
Trane SDDP Fans K Factor
10.50 AF stacked direct-drive plenum 630.00
12 AF stacked direct-drive plenum 839.00
13.5 AF stacked direct-drive plenum 952.00
15 AF stacked direct-drive plenum 1139.00
16 AF stacked direct-drive plenum 1361.00
18 AF stacked direct-drive plenum 1673.00
20 AF stacked direct-drive plenum 1942.00
22 AF stacked direct-drive plenum 2849.00
24.5 AF stacked direct-drive plenum 3590.00
K = N * K-Factor from Table 6 and Table 7.
Where:
K = The final factor to be used for controller
programming.
N = The number of active
*
fans in the system.
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