Trane Performance Air Handlers Installationshandbuch Seite 118

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11 8 CLCH-SVX07C-EN
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. See Table 46 for single-
fan K factors. For a multiple-fan system, the constant
factor K may need to be adjusted depending on how many
transmitters are supplied.
Table 46. Constant K Factors
Fan Size (inches)/Type Fan Class Fan Name K-Factor
9 BC Class I 9 BA 935.00
9 BC Class II 9 BB 868.20
10 BC Class I 10 BA 1072.50
10 BC Class II 10 BB 1072.50
12 AF Class I 12 AA 2337.50
12 AF Class II 12 AB 2237.30
15 AF Class I 15 AA 3873.60
15 AF Class II 15 AB 3873.60
18 AF Class I 18 AA 4675.00
18 AF Class II 18 AB 4675.00
20 AF Class I 20 AA 5843.70
20 AF Class II 20 AB 5119.90
22 AF Class I 22 AA 7513.40
22 AF Class II 22 AB 6624.10
25 AF Class I 25 AA 9683.90
25 AF Class II 25 AB 8891.10
28 AF Class I 28 AA 12,856.20
28 AF Class II 28 AB 11,795.00
32 AF Class I 32 AA 16,295.60
32 AF Class II 32 AB 16,295.60
36 AF Class I 36 AA 19,701.70
36 AF Class II 36 AB 19,367.80
40 AF
1
Class I 40 AA 23,374.90
40 AF
2
Class II 40 AA 25,378.40
40 AF
1
Class I 40 AB 22,974.20
40 AF
2
Class II 40 AB 25,044.50
44 AF Class I 44 AA 30,113.00
44 AF Class II 44 AA 30,113.00
49 AF Class I 49 AB 37,470.00
49 AF Class II 49 AB 37,470.00
20 FC Class I 20 FA 7300.00
20 FC Class II 20 FB 7203.90
22 FC Class I 22 FA 9081.90
22 FC Class II 22 FB 8793.10
25 FC Class I 25 FA 12,030.00
25 FC Class II 25 FB 11,700.00
28 FC Class I 28 FA 14,450.00
28 FC Class II 28 FB 14,036.00
Note:
1
To be used for fan rpm < 700 or cfm < 25,500.
2
To be used for fan rpm > 700 or cfm > 25,500.
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