Retrotec Commercial 441 and 451 DucTester - Manual (Page 37)

Page 37 of 56
©Retrotec Inc. 2015
Leakage Factor from the formula
F= C
L
x P 0.65
Where:
C
L
is the Leakage Class
P is the Test Pressure in in WC
0.65 is the exponent.
Example:
C
L
=12
P =2.0 in WC
0.65 is the exponent.
F=12 x 2.0 0.65 =18.83 CFM per 100 square feet.