A 20 in diameter galvanized steel (smooth) straight duct section conveys air at 3000 ft³/min. It is 45 ft long.
a. Determine the pressure loss, in inches of w.c.
b. Determine the average velocity of air flowing through the duct.
c. Identify a cost-effective rectangular duct section with an equivalent pressure loss that has a side depth of 12 in.