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For example, if you read 1000 CFM at a building pressure of 30 Pa, the "Cannot reach 50 factor" from

Table 15 is 1.36. To get the estimated flow at 50 Pa, make the following calculation:

    

Thus the estimated result for CFM at 50 Pa will be 1360 CFM.

The factors depend on the “n” value chosen, and Table 15 is for “n” of 0.60 which is typical for ducts.

Table 15: Factors for when a duct pressure of 50 Pa cannot be reached (assumed “n” value of 0.60).

Pressure

achieved

Cannot reach

50 factor

Pressure

achieved

Cannot reach

50 factor

1.00

1.52

1.01

1.55

1.02

1.59

1.04

1.64

1.05

1.68

1.07

1.73

1.08

1.79

1.09

1.85

1.11

1.91

1.13

1.98

1.14

2.06

1.16

2.15

1.18

2.24

1.20

2.35

1.22

2.48

1.24

2.63

1.26

2.80

1.28

3.00

1.31

3.25

1.33

3.57

1.36

3.98

1.39

1.42

1.45

1.48

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