Hi. My
sovereign 78 has a cleaver little addition. The former owner mounted a small fan in the space between the ceiling and the folding door track. It measures about 5 x 5" and is wired, with it's own toggle switch, to the wiring for one of the bed reading lights. Sense it is next to the ceiling it helps move warm area into the area on cooler nights. Most of all, it aids in moving AC cool air in the summer. In general, it is very nice on hot days when you want a little moving air in the area when you are reading or napping. He did'nt put the wire through the bedroom wall; instead he put it along the edging of the door frame and then covered it with a matching fabric tape. JLD