The drawing below is a duct system from a central A/C .The air is distributed throw C, F, H, I, K, Land O with (Q= 0.5 m/s). . . 1. Determine the duct diminutions and the velocity for each part of the duct fittings. 2. Calculate the total pressure drop in this rectangular duct fittings if : An elbow E (3 pieces) (R/D=2) An elbow N (5 pieces) (R/D=1) A Parts (B), (D),(G), (J), (M), (R) of the duct fittings Air flow throw the exits is assumed to be infinity that's mean (c = 1)