Products Windows Hung XTherm Series HX32 Single Hung (Tilt-Sash) SpecificationsCAD Details 3 1/4" High Performance Thermal Single Hung (Tilt-Sash) Series 6621 Impact Fixed Window - Blast / DoD SpecificationsCAD Details 3 7/8" Impact Fixed Window Series 663 Impact Single-Hung - Blast / DoD SpecificationsCAD Details 3 7/8" Impact Single Hung Window