In order to reduce the duct static pressure of the hot and cold decks, we reduced the airflow rate from 15,000 CFM to 13,000 CFM. This lowered the static pressure in both ducts by roughly .05" which helped reduce the airflow noise in the control room. Currently one of the dual duct VAVs in the control room also has a degraded control board which will be replaced once available and should help further reduce the airflow noise.