Aluminum-Clad Window: A window with wood construction covered with aluminum sheet having a factory-applied finish (to provide a longer maintenance-free life).

Angle Bay Window: Also see Bay Window.

Architrave: The molded frame or ornament surrounding a window, door or other rectangular opening.

ASHRAE: American Society of Heating, Refrigerating & Air Conditioning Engineers, Inc., 1791 Tullie Circle, N.E. Atlanta, GA 30329. Toll-free for Customer Service: (800) 527-4723 (U.S> and Canada only). Phone: (404) 636-8400. Fax: (404) 321-5478

ASTM: American Society for Testing and Materials, ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA, 19428-2959 USA. Phone: (610) 832-9585.
Fax: (610) 832-9555.

Astragal: An interior molding attached to one of a pair of doors or side-hinged windows in order to prevent swing through; also used with sliding doors to ensure a tighter fit where the doors meet; often on older casements or swinging screens.

Awning Window: A top-hinged sash. See Jal-Awning Window. Introduced in the 1950s.

Balance: See Sash Balance.

Bar: See Muntin.

Basement Window: (Basement Sash or Cellar Sash)- A wood or metal in-swinging sash that is hinged at either top or the bottom.

Bay Window: Windows that project out from the wall and extend to the ground. An Angle Bay Window refers to the angle departure from the plane of the wall. See also Bow Window.

Bottom Rail: The bottom horizontal member of a window sash.

Bow Window: (Compass Window or Radial Bay Window)- A rounded bay window that projects from the wall in the shape of an arc; commonly consisting of five sashes. See also Bay Window.

Boxed Mullion: A hollow mullion between two double-hung windows to hold the sash weight.

Brick Molding: A standard milled wood.

B.T.U.: (Btu)- An abbreviation for British Thermal Unit, commonly show as “Btuy”; the the heat required to increase the temperature of one pound of water one degree Fahrenheit, about the heat from burning one wooden match.

Butyl Tape: See Sealant.

Casement: A window sash which swings open on side hinges; in-swinging are French in origin while out-swinging are from England.

Casement Window: A window with one or more casements.

Casing: (trim)- Exposed molding or framing around a window or door, on either the inside or outside, to cover the space between the window frame or jamb and the wall.

Caulking: A mastic compound for filling joints and sealing cracks to prevent leakage of water and air; commonly made of silicone- bituminous- acrylic- or rubber-based materials.

Celsius: A centigrade scale of temperature measurement based on 0° as the freezing point and 100° as the boiling point of water. Abbreviated °C.

Check Rail: (Meeting Rail or Lock Rail)- The horizontal members (of a double-hung window) which come together.

Circle Top Transom: See Fanlight.

Clerestory: (Clearstory or High-Light Window)- A window in the upper part of a lofty room that admits light to the center of the room.

Coated Glass: A window glass with an outside surface provided with a mirror reflective surface; the shading coefficient ranges from 20% to 45%. See Shading Coefficient.

Colonial: An architectural style associated with an early American period; Early American style c. 1730.

Colonial Windows: Windows with small rectangular panes, or divided lites, designated as 12-lite, 16-lite, etc.

Combination Window Unit: (Combination Storm Sash and Screen)- A window assembly containing a half screen and two glass storm panel; in frame, exposing the screen panel.

Comfort Foam: Expanding polyurethane insulation foam fills critical spaces in extrusions and greatly improves the overall thermal effectiveness.

Commercial Standard: A voluntary set of rules and regulations covering quality of product (or installation, method of testing, rating of the product, certification and labeling of manufactured products

Condensation: The deposit of water vapor from the air on any cold surface whose temperature is below the dew point, such as a window glass or frame that is exposed to cold outdoor air. See Dew Point Temperature.

Convection: See Natural Convection and Forced Convection. A heat transfer process resulting from the circulation or movement of fluids, such as air.

Cove Molding: Trim molding with a concave face.

Crack Perimeter: The total length of the crack around a sash through which outdoor air could leak into the room. In a double-hung window, the total crackage is three times the width plus two times the height of the sash.

Dado: A rectangular slot or groove (with 3 surfaces) cut across the grain of a wood member, into which another board is fitted. See also Plough.

Degree-Day: A measure of heating demand, based on the difference between the mean daily outdoor temperature and 65°F. Cumulative totals for the month or heating season are used by engineers for estimating heating energy requirements.

Design Heat Loss: The calculated values, expressed in units of Btu per hour (abbreviated Btuh), for the heat transmitted from a warm interior to a cold outdoor condition, under some prescribed extreme weather conditions. The values are useful for selecting heating equipment and for estimating seasonal energy requirements. Infiltration heat loss is a part of the design heat loss.

Desiccant: A drying agent, such as silica gel, used by some manufacturers between the panes of insulating glass to prevent fogging between the panes.

Dew Point Temperature: The temperature of the air at which the water vapor in the air starts to condense in the form of liquid or as frost.

Double-Hung Window: Window with two vertically moving sashes, each closing a different part of the window.

Double-Strength Glass: Sheet glass with a thickness between 0.115″ to 0.133″ (3 to 3.38mm).

Double Windows: (Double Glazing)- Two windows, such as a regular window plus a storm sash; also an insulating window with air space between panes.

Double Window: Two windows separated by a mullion, forming a unit. Also called a coupled window.

Drip Cap: A horizontal molding to divert water from the top casing so that the water drips beyond the outside of the frame.

Dry Glazing: A form of glazing in which the glass is secured in the frame with a dry gasket, wood stops, or metal stops, instead of by a glazing compound. See also Reglet.

Dura-Sill: Consists of Soft Seal: Q-Lon Neoprene, structural interlock in the bottom sash and tight mortise-cut, double walled sill dam penetrates inside the jamb.

Emergency Exit Window: (Egress Window)-Fire escape window; large enough for a person to climb out; each bedroom should be provided with exit windows.

Endura-Force Balance System: state-of-the-art balance system provides buttery-smooth operation that never needs lubrication or adjustment.

Extension Jamb: (Jamb Lining or Jamb Extender)- A board used to increase the depth of the jambs of a window frame to fit a wall of any given thickness.

Exterior Casing: See Casing.

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