The duct system shown in Fig. 12-36 is one branch of a complete air-distribution system. The system is a perimeter type located below the floor The diffuser boots turn up 90 degrees. Size the various sections of the system, using the equal-friction method and round pipe. A total pressure of 0.13 in. wg is available at the plenum. Compute the actual loss in total pressure for each run, assuming that the proper amount of air is flowing. Figure 12-36 Schematic for 0.05 in. wg 100 cfm 15 ft Oft 8 ft 20 ft 8 ft 12 ft 0.04 in. WR pressure loss 15 ft 0.036 in. wg 120 cfm