This window retains an AAMA Heavy Commercial rating to meet the most demanding specifications. The Shadowline family window system is an attractive, narrow sightline product for a wide range of applications. Vents and fixed lites are indistinguishable. The thermal barrier provides enhanced thermal performance, while multiple glazing options provide flexibility to meet specific design requirements. Offered with a complete line of sub frames, mullions and architectural sills, the Shadowline window provides the complete solution for your fenestration needs.