Louver Calculation Design:Tthe minimum gap between the louvers is 0.14" and the length of each louver is 3.875". So the total free area for each separator will be 0.14 x 3.875 x 55(number of gaps, between 56 louvers) x 17(columns of louvers) x 2(for two sides) = 7.046 sq.ft.Now for the entire system, free area will be 7.046 x 28 (14 on each side) = 197.29 sq.ft.The total volume of inlet air is 248,000 cfm (including bleed air)Thus, the face velocity comes to be 248000/197.29 = 1257 fpmNow, applying the Darcy-Weisbach Equation to calculate pressure drop; Δp = f (l / d)x(ρ v2 / 2). HERE, I AM NOT SURE WHAT FRICTION COEFFICIENT TO CONSIDER. ALSO, IS IT SAFE TO ASSUME l/d to be 1 since its a duct almost square in shape? I am pretty sure, it should be turbulent flow.