=+12-14.

A backward-curved, centrifugal fan discharges 10.000 cfm (4.7 m3/s) through a 20 × 20 in.

(0.5 x 0.5 m) duct into a plenum. The duct length is 10 in. (0.25 m). Find the lost pressure (sys-

tem effect) for this case. Assume sea-level pressure.

A forward-curved blade fan with a 12 × 12 in. outlet is to be installed in a system to deliver