Compute the airflow in a 12-inch circular duct based on the average duct velocity determined from a Pitotstatic traverse.

The individual velocity pressures across the duct were:

Vertical: 0.07, 0.17, 0.22, 0.39, 0.42, 0.28, 0.14, and 0.11 in. H2O

Horizontal: 0.05, 0.15, 0.23, 0.35, 0.46, 0.33, 0.14, and 0.10 in. H2O.