A duct area of 1.5 ft with the duct velocity of 3,000 fpm will convey airflow of 4,500 cfm. a. From Table 8.1, what duct size would you choose to maintain the minimum velocity of 3,000 fpm? b. In the above question a, what would be the actual duct velocity for the chosen duct size? Table 8.1 Choosing the Correct Duct Diameter a Area Circumference Diameter (in.) in.2 ft in. ft 12 113.1 0.7854 37.70 3.142 13 14 15 345 132.7 0.9218 40.84 3.403 153.9 1.069 43.98 3.665 176.7 1.227 47.12 3.927 16 201.0 1.396 50.26 4.189 17 226.9 1.576 53.41 4.451 18 254.4 1.767 56.55 4.712 21 2222 19 283.5 1.969 59.69 4.974 20 314.1 2.182 62.83 5.236 346.3 2.405 65.97 5.498