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A-Frame Large window with an angled top that follows the line of a slanted roof or ceiling. Application Window installed for a specific use. For example, a skylight or sliding glass door. Atrium/French doors Pair of doors with glass panes. With Atrium-style doors, one door opens; with French-style doors, both sides open. Back to top Bay Three or more windows set at angles to each other within a recessed area. Blackout fabric Fabric that helps block 99% of the sun’s harmful ultraviolet rays and provides complete privacy. Bottom rail Bottom of a window covering. Often moved by lift cords to raise or lower the window covering. Bottom-up Term "top-down/bottom-up" refers to a window treatment with two sets of lift cords that allow the window covering to be raised from the top down or from the bottom up. Bow Curved window that forms an arc extending outward from the wall. Back to top Casement Crank-operated window that opens either inward or outward. Clerestory Shallow window set near the ceiling. Cord tensioner Specially designed cord weight with spring tension and bracket that improves the safety of cord-looped products. Cornice Top treatment constructed on a wood or molded frame that can be stained, padded, or covered with fabric. Back to top Diffusion Method of controlling light at the window, diffusion bends the light coming into the space, causing it to scatter in multiple directions without shadows. Dormer Small window projecting from the house in an alcove-like extension. Double Two windows set side by side, usually double-hung. Double-hung Two-sash window in which one or both sashes slide up and down. Dust and soil resistant Hunter Douglas has created fabrics that are dust, soil and stain resistant. In addition, its aluminum shades are treated with a proprietary dust repellent paint. Back to top Eyebrow Half-oval or ellipse, often installed as a dormer. Back to top French/Atrium doors Pair of doors with glass panes. With French-style doors, both sides open; with Atrium-style doors, one door opens. Back to top Gothic arch Arch whose curves meet in a point at the top. Greenhouse Curved vertical windows that form both the walls and the ceiling of a sunroom. Back to top Hard treatments Window coverings that cover windows, such as shades, shutters or blinds. Conversely, window coverings that primarily decorate windows, such as drapery, swags, or valances, are known as soft treatments. Headrail Top of a window covering. Typically attached to the installation brackets and houses operational components (such as the manual or motorized lifting system). Honeycomb shades Honeycomb shades are accordion-style shades constructed from soft fabrics. The cells, which form a honeycomb design, trap hot and cold air for maximum energy efficiency and sound reduction. Available in single, double and triple cell designs with a variety of pleat sizes. Back to top Inside mount Window covering designed to fit inside a window casing. Conversely, an outside mount is designed to fit outside a window casing. Back to top Jalousie Narrow, horizontal slats of glass maneuvered by a crank. Back to top Lifting system System, manual or motorized, that raises or lowers a window covering. Light dimming Many Hunter Douglas products can be adjusted to provide any level of natural light. When natural light is softened, we refer to this as "light dimming." Louver Vane made of wood, vinyl or fabric. Tilting the louver controls the amount and direction of natural light entering a room. Back to top Opacity Quality of a material that makes it impervious to rays of light. Opposite of sheer. Outside mount Outside mount is designed to fit outside a window casing. Conversely, an inside mount is designed to fit inside a window casing. Back to top Palladian Classical window form distinguished by its graceful arch. Pleated shades Shade where the fabric is folded and creased in an accordion-like manner. Back to top Roman shade Flat fabric shade that folds into neat horizontal pleats when it is raised. Room-darkening fabric Fabric that has been treated or is constructed to block out a large portion of the sunlight. Back to top Sash Framework that holds the panes of a glass in a glazed window or door, including the narrow bars between the panes. Semi-opaque Material that makes it partly impervious to rays of light. Sheer Quality of a material that makes it capable of transmitting light and allowing a clear view of what lies beyond. Opposite of opacity. Shutters Stationary window covering, designed for interior use, usually constructed with adjustable slats. Soft treatments Window coverings that primarily decorate windows, such as drapery, swags, or valances. Conversely, window coverings that cover windows, such as shades, shutters or blinds, are known as hard treatments. Soil and dust resistant Hunter Douglas has created fabrics that are dust, soil and stain resistant. In addition, its aluminum shades are treated with a proprietary dust repellent paint. Swag Top treatment with fabric that falls from the top of a board or pole, looping downward, then back up one or more times. Back to top Tieback Piece of fabric cut in any of several styles, used to hold a drapery panel back. Top-down Term "top-down/bottom-up" refers to a window treatment with two sets of lift cords that allow the window covering to be raised from the top down or from the bottom up. Traverse rod Rod used to open or close vertical blinds. Back to top Uniform exterior appearance Viewed from outside the home, the window coverings with "uniform exterior appearance" look as if they are a single panel of material. UV Acronym for the sun's ultraviolet light. Back to top Valance Decorative fabric treatment used at the top of window coverings.