To help architects and building owners maintain the historic look of a building while providing high energy efficiency, Traco, a division of Kawneer Co., introduced its NX-4000 Series thermal window. By incorporating the benefits of Traco's NX-3000 projected window series, the NX-4000 series thermal window offers the performance of a projecting window with the distinctive look of a hung window, a combination suited for specialized retrofit projects. Featuring Traco's NexGen Thermal Barrier System, NexGen Energy Spacer and 1-inch insulating glass, the window offers strong air and water performance, according to a release. It can be triple glazed, using the combination of a 1-inch IG unit, access panel and internal blinds. Bevel edge framing on the vents and fixed lites replicate the look of a putty glazed window, while optional exterior profile muntin grids can simulate divided lites and offer several additional design options.Traco, a division of Kawneer Co.