Question: =+12-36. pressure external to the unit. The return air system requires 0.10 in. wg. The ducts are to be of round cross section, and the

=+12-36.

pressure external to the unit. The return air system requires 0.10 in. wg. The ducts are to be of round cross section, and the maximum velocity in the main run is 850 ft/min, whereas the branch velocities must not exceed 650 ft/min.

(a) Size the ducts using the equal-friction method. Show the location of any required dampers. Compute the total pressure loss for the system.

(b) Size the ducts using the balanced-capacity method.

(e) Size the ducts with both methods using the program DUCT on the website.

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