This insulated box is designed to be used exclusively with the EDGE series of high performance of down lights. It includes two(2) hole sizes to accommodate either the 4'' or 5'' EDGE series. The box is designed for ceilings with insulation. Can be used in new construction, remodeling or acoustic tile applications. Adjustable mounting bars allow for installation between 13.0" (320mm) to 26.0" (660mm) - included. Resists to extreme temperatures.Suited for the following EDGE series products: EG-LED-400 series and the EG-LED-500 series.Approved for damp locations, housing completely sealed, stops any air exchange within the ceiling cavity.Ideal for high energy efficiency construction. Galvanized steel construction.CSA & UL APPROVED.