An air curtain doorway defining an opening between at least two zones, including an air curtain having an air supply duct and an air return duct joined by a connecting duct. The configurable multi-pole relay system can include a first relay module, a second relay module, and a connecting structure. The fragments include respective regions having a designated time duration. As a result, the number of circuits is increased, by means of only enlargement of widthwise direction Y which is easy to increase while enlargement of longitudinal direction X stemming from packaging of circuits is minimized. Consumption data is collected during consumption of the media item. A set of itineraries can be generated based upon the segments in the base schedule, and each itinerary can include an origin, a destination, and one or more segments linking the origin and the destination.