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| Aluminum-clad windows and doors: Windows or doors of wood construction covered on the exterior with extruded or roll-formed aluminum. Has a factory-applied finish to deter the elements. |
| Argon: An odorless, colorless, tasteless, nontoxic gas that is six times denser than air. Replacing the air between two panes of glass with argon gas reduces temperature transfer, making the surface of the glass inside the house closer to the inside temperature. |
| Astragal: The center member of a double door, which is attached to the fixed or inactive door panel. |
| Apron: Inside horizontal trim located under the window stool at the bottom of a unit. |
| Auxiliary frame window: A direct set window frame where glass is set directly into a frame without a sash. Is used in the creation of geometric and radius windows. |
| Awning window: Hinged at the top, this window has a single sash that swings outward from the bottom. |
| Balance: Device for counterbalancing a sliding sash, usually associated with a double-hung window, so sash may be held open at any given position. Usually a system of cords, weights, springs, spiral devices or block and tackle hardware. |
| Bay window: A composite of 3 or more windows that project out from the wall. Usually consists of one large center window with two flanking fixed or operating windows at 30, 45, or 90 degree angles to the wall. |
| Bottom rail: Bottom horizontal member of a window sash. |
| Bow window: A composite of 3 or more windows in a radial or bow formation. Typically consists of casement windows both fixed and operating assembled at 10 degree angles from the wall. |
| Brickmold: Standard outside casing around the window to cover the gap between the window frame and the opening. Nails are driven through the molding to install the window to the framed opening. |
| Caming: Lead strips which bond small pieces of decorative glass in windows. |
| Casement: A window with side hinges that cranks outward from either the right or left. |
| Casing: Molding or trim available in many widths, thicknesses and profiles applied to the frame around a window or door to cover the space between the window frame and wall. |
| Check rail: On a double-hung window, the bottom rail of the upper sash and the upper rail of the lower sash, where the lock is mounted. |
| Cladding: Usually an aluminum or vinyl material fixed to the outside faces of wood windows and doors. |
| Clerestory window: A venting or fixed window in the upper part of a lofty room that admits light to the center of a room. |
| Cottage double-hung window: A double-hung window in which the upper sash is shorter than the lower sash. |
| Crank handle: A handle that attaches to an awning or casement operator, used to open the venting window. |
| Dormer window: A space which projects from the roof of a house, usually including one or more windows. |
| Double-hung window: A window with two vertically moving sashes, each closing a different part of the window. |
| Drip cap: Horizontal exterior molding to divert water from the top casing so water drips beyond the outside of the frame. |
| Extension jamb: A board used to increase the depth of the jambs of a window frame to fit a wall of any given thickness. |
| Fixed light (also fixed sash): Window or sash which is non-operative or non-venting. |
| Frame: An enclosure or combination of parts which surround a window sash or door panel. |
| French sliding doors: A sliding door which has wider panel members around the glass, giving it the appearance of a hinged French door. |
| Geometric window: A fixed framed window made up of 2 or more angles (i.e., pentagon or trapezoid). |
| Glazing: The glass panes or lights in the sash of a window. Also the installation of glass in a window. |
| Glazing bead (also glass stop):Removable trim that holds glass in place. |
| Gothic-head window: Window topped with a pointed arch. |
| Grille (or muntin bar): Usually removable for easy cleaning, grilles give the appearance of a divided window pane. |
| Head jamb (also head): All of the horizontal members that make up the top of the window or door frame. |
| Impact resistant glazing: Glass specifically manufactured to withstand impacts from airborne objects or forced entry. Usually a type of laminated glass often used in coastal areas impacted by hurricanes. |
| Insulating glass: A combination of 2 or more panes of glass with a hermetically sealed air space between the panes. The space may be filled with an inert glass such as argon. |
| Jamb: The vertical members at the side of the window or door frame. |
| Jamb depth: Width of the window frame from inside to outside. |
| Jamb liner: The plastic or metal track installed in the jambs of the window in which the window sash slide. |
| Keeper: The hook-shaped piece of hardware that it is mounted on the inside sash stile of a casement window in which the sash lock engages. |
| Laminated glass: Similar to the construction of car windshields, this technique sandwiches a piece of transparent film or plastic between two panes of glass. Typically used for safety reasons because of its resistance to shattering. Also reduce noise transmission to the interior. |
| Low-E Glass: A term used to refer to glass which has low-emissivity due to a film or metallic coating on the surface of the glass. Usually constructed of dual, sealed panes of coated glass filled with pure inert gas to block ultraviolet heat, for cooling purposes, while reflecting room heat back into the room for heating purposes. |
| LVL: Laminated Veneer Lumber - A combination of many pieces of veneered lumber glued together to give added structural capabilities. |
| Meeting rail (also lock rail): One of the two horizontal members of a double-hung sash which come together. A check rail. |
| Meeting stile: The vertical member in a pair of stiles, as in abutting casement windows. |
| Mortise: Refrigeration device that can be usedrld they are also known as "Reverse Cycle". |
| Mortise and tenon: A strong wood joint made by fitting together a mortise in one board and a matching projecting member (tenon) in the other. |
| Mullion: A vertical member (usually wood or metal) to structurally join two window or door units. |
| Muntin: Vertical or horizontal bars used to separate glass in a sash into multiple lights. Often called a grille. |
| Nailing Fin: A vinyl or aluminum extension attached to the frame of a window or door which creates a positive seal between the window and the framed wall. Acts as an additional barrier against air and water leakage. Screws or nails are fastened through the fin to hold the unit in the opening. |
| Palladian window: A large, arch-top window flanked by smaller windows on each side. |
| Parting stop: A vertical strip on each jamb that separates the sash of a double-hung window. |
| R-Value: The measurement of resistance to heat transfer in a material. The higher the R-Value, the greater the insulation value. |
| Sash: Framework of stiles and rails in which the glass of a window or door is set. |
| Sash lock: A lock applied to the window to pull the sash tightly against the frame (casement) or to pull the check rails together (double-hung) in order to seal the sash from weather and for security. |
| Seat board: A flat board cut to fit the contour of a bow or bay window and installed between the sill and the wall surface, providing a seat or a shelf space for plants, etc. |
| Side light: A fixed, often narrow glass window next to a door opening or window opening. |
| Sill: Horizontal member at the bottom of the window frame. |
| Simulated divided lights: A method in constructing windows or doors in which muntins are fixed to the inside and outside of the insulated glass panel to simulate the look of a true divided light. |
| Single-hung window: Window similar to double-hung window, except the top sash is stationary. |
| Slide-by window: Windows which slide horizontally. |
| Stacked windows: Combined grouping of awning, casement, or non-operative windows to form a large glazed unit. |
| Stile: Vertical member of a window sash or door panel. |
| Stile Lug or Horn: One of two extensions of the sash stiles to support the upper sash of a double-hung window. |
| Stool: One of two extensions of the sash stiles to support the upper sash of a double-hung window. |
| Stop: Refrigeration system where the refrigerant pump or a/c system. |
| Tandem lock: A locking system which secures the window at two locking points by the operation of one lever. |
| Tempered glass: Special heat-treated, high-strength safety glass which shatters into pebble-sized particles and not in slivers. |
| Tenon: A rectangular projection cut out of a piece of wood for insertion into a mortise. |
| Thermal break: A thermal insulating barrier between two thermally conductive materials. |
| Transom joint: Horizontal member separating a door from a window panel above the door, or separating one window above another. |
| Transom: Small window located above a door or another window. |
| Weather-stripping: A strip of resilient material applied to the perimeter of the sash and/or frame of a window or door to minimize the potential for water and air infiltration. |
| Windload: The force exerted on a surface by moving air. |
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