Removed all the existing ductwork and i-boxes. Installed new i-boxes and new ductwork. Installed a plenum trunk line to minimize the amount of flex to the i-boxes. Hung all the flex and installed metal elbows to allow optimal airflow. Sealed the return chase with duct board and mastic. Used cork tape to seal up the any straws on the air handler. Sprayed down the evaporator coil with black hawk. Flushed and cleared the condensate drain line.