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Testimonials
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Please use our glossary to help become more familiar with the words, terms and phrases commonly found and used in the screens, windows and doors industry. You may either display the set of terms by A-Z or use our search form below to look for a particular term.
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| E E.P.D.M |
| (Ethylene Propylene Diene Monomer) is a type of elastomeric material which has excellent resistance to ozone, sunlight, and severe weather conditions and is ideal for outdoor service. |
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| Edge Blocks |
| Short lengths of elastomeric materials located at one or both sides of a glass light to limit lateral movement ("walking") caused by horizontal expansion/contraction, minimal building sway or other factors. |
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| Edge Clearance |
| The dimension between the edge of the glass or panel and its surrounding frame which is measured in the plane of the glass or panel. |
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| Edge Cover |
| The dimension by which the inner edge of the frame or stop overlaps the edge of the glass or panel. |
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| Edge Effects |
| Two-dimensional heat transfer at the edge of a glazing unit due to the thermal properties of spacers and sealants. |
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| Edge Of Glass |
| The glass area within 2 1/2" (10cm) of the edge of a window. |
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| Eflective Glass |
| Glass with metallic coatings applied onto or into the glass surface to reduce solar radiant energy and visible light transmission. |
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| Egress Window |
| A window with specific release hardware and minimum clear opening size to allow occupants to escape through the window in case of a fire. |
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| Egress Window |
| A window meeting certain size requirements for egress. The size is determined by national or local building codes. Typically, the rule is 5.7 sq. ft. of clear opening, 20" minimum clear width and 24" minimum clear height. |
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| Elasticity |
| The condition or property of being elastic; flexibility. |
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| Elastomeric Material |
| A term often used for rubber and polymers that have properties similar to those of rubber. Thermal break polymers having the elastic properties of natural rubber. |
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| Electrochromics |
| Glazing with optical properties can vary continuously from clear to dark with a low-voltage signal. Ions are reversibly injected or removed from an electrochromic material, causing the optical density to change. |
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| Electrolysis |
| Chemical decomposition of a metal surface by the action of dissimilar metals and moisture. |
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| Electromagnetic Spectrum |
| Radiant energy over a broad range of wavelengths. |
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| Electrostatic |
| A painting process by which the aluminum is grounded and the paint carries a positive electric current. This creates a magnetic attraction between the paint and the aluminum allowing for uniform paint coverage on extrusion surfaces that are exposed when the assembled window is installed and closed. |
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| Electrostatic Painting |
| A painting process by which the aluminum is grounded and the paint carries a positive electric current. This creates a magnetic attraction between the paint and the aluminum, allowing for uniform paint coverage on all exposed extrusion surfaces. |
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| Emergency Exit Window |
| Fire escape window (egress window) large enough for a person to climb out. In U.S. building codes, each bedroom must be provided with an exit window. The exact width, area, and height from the floor are specified in the building codes. |
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| Emergency Release |
| A safety device other than panic hardware which permits egress through an entrance door under emergency conditions. |
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| Emissivity |
| Emission, or the ability to radiate heat in the form of long-wave radiation. |
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| Emittance |
| The ratio of the radiant flux emitted by a specimen to that emitted by a black body at the same temperature and under the same conditions. |
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| End Dam |
| Used to close the ends of a subsill so the water will not leak out the ends. It makes the subsill a complete water trough allowing it to collect excess water and drain it to the exterior. |
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| Entrance |
| The doorway, vestibule or lobby through which one enters a building. |
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| EPDM |
| Ethylene Propylene Diene Monomer – a modest-cost weather-resistant synthetic rubber from which many flexible gaskets for windows are made. |
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| ER Rating |
| Energy rating number developed by the CSA (Canadian Standards Association) to compare the thermal performance of windows. Measured in watts per square meter (W/m2). |
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| Escutcheon Plate |
| Back plate for handles and deadbolts. |
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| Etched Glass |
| glass that has had a pattern cut into its surface, usually by an acid treatment. |
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| Expansion Mullion |
| expansion mullion
Self-mulling window frame jambs that, when slipped together, permit expansion and contraction while preserving strength and watertightness. This is particularly important on large runs of windows, since aluminum will expand or contract 1/8" in 8’ in a 100 degree temperature difference.
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| Exterior Glazed |
| Glass glazed from the exterior of the building. |
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| Extrudability |
| This term is used to compare the relative resistance of different alloys and/or shapes to deformation in the extrusion process and is usually based on pressure required and attainable extrusion speed. |
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| Extrudability Limits |
| A set of guidelines established by the Aluminum Association which provides limits on the production of extrusions. Dimensional tolerances, gap-width ratios, extrusion factor and circumscribing circle are examples of these limits. |
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| Extrude |
| The process of shaping aluminum or vinyl by forcing it through a die. |
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| Extruded Aluminum Shapes |
| There are two basic types of extruded shapes; Solid Extrusion - Any extruded shape other than a hollow or semi-hollow shape. Semi-Hollow Extrusion - An extruded shape where any part of the cross section partially encloses a void. The area of the void bears a fixed ratio to the square of the gap as shown in published tables developed by the Aluminum Association. |
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| Extrusion |
| The metal-fabricating process by which a heated aluminum billet is forced to flow through a hole in a steel die of the desired shape. Also see Extrusion Press. |
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| Extrusion Circle Size |
| This is represented by the diameter of the smallest circle that will completely enclose the aluminum extrusion. For a die with two or more holes, the diameter of the smallest circle that will enclose all the holes in the die is designated as the layout circle. Also see Extrusion Side Wall Clearance. |
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| Extrusion Die |
| A steel plate or forging having a hole of the desired extrusion shape through which the aluminum is forced to flow. The die is specially machined to control the flow of metal. |
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| Extrusion Die Support Too |
| These include the steel die ring, die backer, bolster and sub-bolster and have the purpose of supporting the die against the very high pressures of extrusion and transferring these forces to the head of the press. |
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| Extrusion Factor |
| The numeral representing this term is the ratio of the perimeter of an aluminum extrusion to its weight per foot. It is a measure of the complexity of an extruded shape represented on the die drawing. Thin wall sections have high factor numbers and are more difficult to extrude. A solid round section has the lowest factor and would require less extrusion pressure than a more complicated shape with a high factor but an equivalent weight per foot. |
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| Extrusion Press |
| A hydraulic press used for forcing heated aluminum ingots (billets) through a hole in a steel die of the desired shape. |
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| Extrusion Pressure |
| The pressure available for aluminum extrusion is determined by dividing the press capacity in pounds by the cross-sectional area of the bore of the container in square inches. |
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| Extrusion Ratio |
| This is determined by dividing the cross-sectional area of the bore of the container by the sum of the cross-sectional areas of the holes in the die. It is the measure of the deformation required to reduce the aluminum billet size to the extrusion size. |
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| Extrusion Side Wall Clear |
| One-half the difference between the container diameter and the layout circle. This clearance is necessary to avoid feed-in of the liquated outer surface of the extrusion billet or of the skull that may adhere to the wall of the container. Greater side wall clearances are specified for extrusions with very critical surface requirements. Also see Extrusion Circle Size. |
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| Eyebrow Windows |
| Picture windows that are segments of circles rather than arch windows which are half circles. |
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