Highly functional design that saves energy and enhances safety. The Cobalt 4 Air-Tight Quick Connect Remodel Housing by Nora Lighting is designed for use in an existing sheetrock ceiling. It is used for lighting installation in ceilings where the access is available only from below. It is used in a non-insulated ceiling, only where the insulation can be kept 3-foot from the fixtures. The air-tight construction reduces the flow of air through the ceiling, thereby saving on energy bills.