If you are building cubicles, then it is advised that the cubicle has a gap of around 2ft or more of space between the top of the cubicle and the ceiling, this is to allow the air flow to circulate. It will also require an inch taking from the top and bottom of the door, to allow the air flow into the room, cool air coming into the room and hot air going out.
You will require a large extractor fan and air vent in the room where the sunbed is going. This will help cold air to be drawn in and hot air to be pushed out of the room.
