Constant Factor K - Trane CSAA Installation, Operation And Maintenance Manual

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Constant Factor K

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.
Table 51. Constant K factors
Fan Size (inches)/Type
9 BC
9 BC
10 BC
10 BC
12 AF
12 AF
15 AF
15 AF
18 AF
18 AF
20 AF
20 AF
22 AF
22 AF
25 AF
25 AF
28 AF
28 AF
32 AF
32 AF
36 AF
36 AF
40 AF
40 AF
44 AF
44 AF
49 AF
49 AF
20 FC
20 FC
22 FC
22 FC
25 FC
25 FC
28 FC
28 FC
138
Fan Class
Medium Pressure
High Pressure
Medium Pressure
High Pressure
Low or Medium Pressure
High Pressure
Low or Medium Pressure
High Pressure
Low or Medium Pressure
High Pressure
Medium Pressure
High Pressure
Medium Pressure
High Pressure
Medium Pressure
High Pressure
Medium Pressure
High Pressure
Medium Pressure
High Pressure
Medium Pressure
High Pressure
Medium Pressure
High Pressure
Medium Pressure
High Pressure
Medium Pressure
High Pressure
Low or Medium Pressure
High Pressure
Low or Medium Pressure
High Pressure
Low or Medium Pressure
High Pressure
Low or Medium Pressure
High Pressure
Fan Name
9 BA
9 BB
10 BA
10 BB
12 AZ or 12 AA
12 AB
15AZ or 15 AA
15 AB
18AZ or 18 AA
18 AB
20 AA
20 AB
22 AA
22 AB
25 AA
25 AB
28 AA
28 AB
32 AA
32 AB
36 AA
36 AB
40 AA
40 AB
44 AA
44 AB
49 AA
49 AB
20FZ or 20 FA
20 FB
22FZ or 22 FA
22 FB
25FZ or 25 FA
25 FB
28FZ or 28 FA
28 FB
K-Factor
790.00
733.60
1035.00
1035.00
2030.00
1943.00
3320.00
3320.00
4301.10
4301.10
5100.00
4468.30
6970.00
6145.10
9127.10
8379.90
11000.00
10092.00
14035.00
14035.00
18537.00
18222.80
22889.00
22542.20
28875.80
28438.30
36020.00
35474.30
8576.00
8463.10
10890.00
10543.70
14795.00
14389.20
17528.00
17025.80
CLCH-SVX07K-EN