Retrotec DM-2A Manuel d'utilisateur télécharger pdf (Page 61)

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Pressure

achieved

Cannot reach

50 factor

Pressure

achieved

Cannot reach

50 factor

1.00

1.57

1.01

1.61

1.03

1.66

1.04

1.71

1.06

1.76

1.07

1.81

1.09

1.88

1.10

1.94

1.12

2.02

1.14

2.10

1.16

2.19

1.18

2.29

1.20

2.40

1.22

2.53

1.24

2.68

1.26

2.85

1.28

3.05

1.31

3.29

1.34

3.59

1.36

3.97

1.39

4.47

1.42

1.46

1.49

1.53

Cannot Reach 25 Pa Factors

Rather than using the equation in the situation where the 25 Pa test pressure cannot be achieved, you

can use tables with the factors already calculated and the following procedure. Take a flow (CFM)

reading at the pressure achieved and multiply by the "Cannot reach 25 Pa factor” from Table 14 to get

an estimate of the flow that would result at 25 Pa.

For example: if you read 600 CFM at a building pressure of 19 Pa, the "Cannot reach 25 Pa factor"

from the table is 1.18. Make the following calculation:

    

Thus the estimated result for CFM at 25 Pa will be 708 CFM.

The factors depend on the n value chosen, and Table 13 is for n of 0.6 which is typical for duct systems.

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 71 72

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Retrotec DM-2A Manuel d'utilisateur Page 61

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