Thermally efficient windows are an attractive way to bring in natural light to reduce your lighting bills while adding aesthetic appeal to the exterior of your building. Self-flashing and self-framing aluminum windows are available with Thermal-Break or Non-Thermal Break frames. Thermal Break frame windows can be shipped pre-assembled in galvanealed sub-frame assemblies. Styles include Casement, Awning, Project-In, Horizontal Sliding, Single Hung and Fixed Picture in a variety of sizes.