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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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| U Value |
| A measurement of heat transmission. The U value of a window is measured by the number of BTU's that will pass through each square foot of area per degree of temperature difference from one side of the window to the other (the lower, the better). U value = the number 1 divided by the R value. |
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| U-Factor |
| A measure of total heat flow through a window or door barrier from room air to outside air. Lower numbers indicate greater insulating capabilities. |
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| U-Value |
| Measures the heat transfer through a material due to the difference in air temperatures on the two sides. (Lower U-values indicate better performance.) Also see Thermal Transmittance. |
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| U.L. |
| Underwriters' Laboratories, Inc. |
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| Ultraviolet Light (UV) |
| The invisible rays of the spectrum that are outside of the visible spectrum at its short-wavelength violet end. Ultraviolet rays are found in everyday sunlight and cause paint finishes, carpets, and fabrics to fade. |
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| Ultrex® |
| An energy-efficient, infinitely durable composite material made of polyester resin and glass fibers, used in many Marvin products. |
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| Uniform Building Code (UBC) |
| The building code generally used in the western United States, developed by the International Conference of Building Officials (ICBO) in Whittier, CA. Area of influence; Regions in the United States west of the Mississippi River. Replaced by ICC. |
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| Uniform Construction Index |
| CSI format system to standardize classification of construction-related products; united inches the sum total of one window width and one window height expressed in inches. |
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| United Inches (UI) |
| The sum total of one window width and one window height expressed in inches. |
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