=+12-38.

Design the duct system shown in Fig. 12-39 using the balanced-capacity method. Circular ducts are to be used and installed below a concrete slab. The total pressure available at the plenum is 0.18 in. wg, and each diffuser has a loss in total pressure of 0.025 in. wg. Use the equivalent-

length method of allowing for losses in the fittings. Also size the ducts with the program DUCT on the website.