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Calculating Duct Resistance
Figure 53
Duct
Dia.
Approximate
Static Pressure
Loss Per Foot of
Rigid Pipe
Approximate
Static Pressure
Loss Per Foot
of Flex Pipe
Fitting
Dia.
90˚
Elbow
45˚
Elbow
45˚
Wye(Y)
90˚
Wye(Y)
Figure 53.
To calculate the static pressure of any given
line in the system:
1.
Figure 53
2.
Figure 53
3. Figure 54
4.
Figure 55
Note: Always account for a seasoned filter,
so you don't end up with a system that only
works right when the filter is clean.
Additional Factors Static Pressure
Figure 54.
Figure 55.
Main Line
6" Rigid Pipe (0.037) at 20' ................ 0.740
Branch Line
4" Rigid Pipe (0.075) at 10' ................ 0.750
4" Flex Pipe (0.28) at 5' ........................ 1.400
Elbows/Branches
6" 45˚ Y-Branch ................................ 0.329
4" 45˚ Elbow ........................................ 0.225
Additional Factors
Seasoned Filter ................................ 1.000
Total Static Pressure Loss ................ 4.444