A blower delivers air at 3000 m3/h to the duct circuit in Fig. P6.117. Each duct is commercial steel and of square cross-section, with side lengths a1 = a3 = 20 cm and a2 = a4 = 12 cm. Assuming sea-level air conditions, estimate the power required if the blower has an efficiency of 75%. Neglect minor losses.

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(2) 30 m Blower 40 m