58 Installing Vertical Adapter [vertical adapter models shown on page 8} Vertical wall adapter allows a damper box fo be installed in the wall instead of the ceiling. A vertical adapter is installed on the wall with the damper box mounted diagonally to the wall so the deeper doors close properly when the fan is turned off. HOT: Measure the studs in your wall. If they are 18" yarn Adapter Video: on canter, you will need to follow steps 1 through 4 watchdog the video by completely.