Position two deck post mounts on the floor at each end of where you want the divider within the room. Space the mounts 96 inches apart. Place the remaining deck post mount in the center between the two end mounts.
Drive the mounting screws that were included with the deck post mounts through the mounting holes into the floor using a screw gun.
Place one end of each post into the deck post mounts. Drive the screws included with the deck post mounts through the mounting holes into the posts.
Position one handrail bracket 18, 28 and 32 inches from the floor on each side of the division. Fasten the brackets to the posts by driving the screws included with the brackets through the mounting holes into the posts with a screw gun.
Center a handrail across each corresponding set of handrail brackets along the posts. Drive the screws included with the brackets through the mounting holes in the brackets into the bottom of the handrails.