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Calculating Duct Resistance
Figure 41
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 41.
Additional Factors Static Pressure
To calculate the static pressure of any given
line in the system, follow these steps:
1.
Figure 41
2.
Figure 41
3. Figure 42
Figure 42.
4.
Figure 43
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.
Figure 43.
Main Line
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Branch Line
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);aZmE^eZ%#'-Vi* ######################## &#)%%
Elbows/Branches
+)*ßN"7gVcX] ################################ %#('.
))*ß:aWdl ######################################## %#''*
Additional Factors
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Total Static Pressure Loss ................ 4.444