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Cannot Reach 25 Pa Factors

Take CFM reading at pressure achieved and multiply by "Cannot reach 25 Pa factor" to get pressure at

50 Pa. e.g. read 600 CFM at building pressure of 19 Pa. Factor is 1.18,

600 x 1.18 = 708 CFM

Table 11. Factors for when a building pressure of 25 Pa cannot be reached (“n” value of 0.6).

Pressure

achieved

Cannot reach

50 factor

1.00

1.02

1.05

1.08

1.11

1.14

1.18

1.22

1.26

1.31

1.36

1.42

1.48

1.55

1.64

1.73

1.85

1.98

2.15

2.35

2.63

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Retrotec DM-2A Manual do Utilizador Página 59