A large window area accepts direct sunlight while thermal mass serves as storage. A removable interior glass panel which creates an air space between the exterior glazing and itself. It provides improved insulation and condensation control and allows for between-glass shading options such as muntins, blinds and pleated shades. A window unit that has two operable sashes which move vertically in the frame. Two vertically sliding sash which by-pass each other in a single frame.
Sashes typically fit within vinyl balances and tilt out and remove for safe, easy cleaning.
A molding placed on the top of the head brickmold or casing of a window frame. A material that has two or more levels of flexibility. An example is the weatherstripping used between the frame and sash of a Pella casement window. This creates a magnetic attraction between the paint and the aluminum allowing for uniform paint coverage on all exposed extrusion surfaces. It makes the subsill a complete water trough allowing it to collect excess water and drain it to the exterior.