Select Room Duct Feeds
Open this page by clicking the Select button under the "Get airflow from load calc. room" option on the Duct Data page while a supply runout is selected in the duct tree.
Select Button: Assigns the indicated room's supply airflow to the current supply runout, and returns you to the Duct Data page. If you assign more than one supply runout duct to the same room the supply airflow for that room will be equally divided among all those runouts.