TP90-11: Film Fill Recent Research and Application DataFilm fill is the use of flat or formed sheets to provide a surface upon which liquid and air come in contact with each other to effect the exchange of heat. The only other fill options available to a cooling tower designer is the use of splash fill or combinations whereby heat exchange occurs on the surface of water droplets, or both. As film fill allows the designer the opportunity to build a more compact, cost effective, energy efficient cooling