**DuctExtractBranch90B_CL**

Returns the pressure drop associated with an extract duct with a branch. The branch is at 90 degrees and the ducts have circular cross-section. The pressure drop should be applied to the flow from the branch. The function uses the information from the Lindab website.

DELTAP = **DuctExtractBranch90B_CL**(F$, v_3, v_1, T, P)

**Inputs:**

F$: fluid string identifier

v_3: velocity in main duct upstream of branch (m/s, ft/s)

v_1: velocity in branch (m/s, ft/s)

T: inlet temperature (K, C, F, or R)

P: inlet pressure (bar, atm, Pa, kPa, or MPa)

**Output:**

DELTAP: pressure drop (bar, atm, Pa kPa, or MPa)

**Example: **

$Load Component Library

$UnitSystem SI Mass kJ C Pa

$VarInfo DP Units='Pa'

F$ = 'Air'

T = 20 [C]

P = 100000 [Pa]

v_3 = 8 [m/s]

v_1 = 8 [m/s]

DP = **DuctExtractBranch90B_CL**(F$, v_3, v_1, T, P)

{**Solution:**

DP = 38.49 [Pa]}