Glass performance chart pdf. If you need even more specific information.

Glass performance chart pdf Where (#2) appears, this identifies the glass’ coated surface that is glazed to the inside of a building or the inside of a ThermoTech unit. Download our energy management performance comparison chart so you can see how our products measure up to each other in terms of daylight transmission, solar control, insulation and more. Technical Glass Guide. It represents the heat gain through 3mm clear 3/4” (19mm) Insulating Glass Unit Performance Using 1/8” (3mm) Glass - Based on LBNL Window 6. com Website: www. 38mm grey 42 5 5 0. By Performance. 04 na 0. 2020-es-gap - 1 - Approximate Sound Levels Onset of Values are center of glass calculated using LBNL Window 7 per NFRC100 conditions. ‘Low-E’ refers to ‘low thermal emissivity glass’ which provides better insulation than standard glass. 86 Solarbronze® Glass 1/8 3 Product Performance and Comparison Data. LoĒ³-366 Coated Glass | Low-E Glass | Cardinal Glass Industries Cardinalcorp. 74 0. 02 na 0. 67 5. 89 13 gray 0. 37 SHGC. Vitro Architectural Glass provides a wide selection of product literature to assist architects and specifiers in evaluating the aesthetic and performance characteristics of our products. Gas Library ID#1 (Air) is used for Insulating Glass units with air. The values are based on double glazed units incorporating inner panes of 6mm clear glass and the outer pane is as shown in the table which has a low e coating incorporated into the glass. com specification section 088000 | us. 8 operated by Lawrence Berkeley National Laboratory (LBNL) using International Glazing Database (IGDB) v102. annealing float glass is the process of controlled cooling to prevent residual stress in the glass and is an inherent operation of the float glass manufacturing process. LoĒ³-366 delivers the ideal balance of solar control and high visibility. The These comprehensive charts present an in-depth breakdown of performance characteristics across vital categories for our diverse glass products. , ¼” glass + interlayer + 3/ 8” glass For Insulating Glass Units Increase glass thickness Increase air space dimension The performance characteristics of Cardinal’s LoĒ® products are shown on the attached insulating glass performance charts. 3 software and represents center of glass performance data. 28 single glass performance values vlt visible light transmission vlr visible light reflectance vlri visible light reflectance shgc u-value colour and type % external % internal % w/m2k tinted pvb continued 8. 31 5/16 8 61 6 6 1. The following products and combination of products are compared: • IG units with nominal 3 mm and 6 mm glass substrates; • IG units with clear, green, gray, and bronze non-coated glass substrates; Data is based on center of glass performance of representative factory production samples. On a clear-over-clear double-glazed configuration, its superb 68% visible light transmission with only 11% reflectivity can help illuminate interiors, expand views, and connect indoors and out. com www. By Appearance. 29 3. Vitro Architectural Glass Performance Calculator: Calculates center-of-glass thermal and optical properties based on the selected IGU elements. Actual values may vary due to production tolerances. 67 0. e. annealed glass can be cut, machined, drilled, edged and polished. See full list on vitroglazings. Solar Heat Gain Coefficient: the amount of solar radiation which enters the house through radiation. 5 76 17 18 62 16 48 0. 6 10. 53 1. Read more about the tools below Download technical files for window and door size charts, product design and performance information, BIM files, architectural specifications and more. 52mm grey 43 5 5 0. 31 3. 3 software. Performance Data 1 of 6 and Comparisons The performance characteristics of Cardinal’s LoĒ® products are shown on the attached “Insulating Glass Performance Comparison” charts. Comparative Residential IG Data Table; Tinted Glass with Low-e Glass Comparative Data Table; Vitro Monolithic Glass Comparisons A laminate is two or more sheets of glass with an inner layer of transparent plastic (interlayer material) to which the glass is adhered. 34 53 NO NO NO YES Pfaudler Pharma Glass PPG plays a trail-blazing role in the production of pharma-ceutical products, whereas Pfaudler Anti Static Glass ASG solves the problems associated with electrostatic charging. 26 Azuria® Glass 5/32 4 75 7 7 1. glass performance chart thermally broken aluminum windows 1/4” non-impact u-f shgc vt cog vt cr clear 0. The standard 1″ commercial Insulating Glass (IG) unit consists of two lites of 1/4″ glass and a nominal 1/2″ air space. SGG Midas Gold is an advanced coated glass manufactured by the state-of-art magnetron sputtering process under vacuum conditi AGC GLASS COMPANY NORTH AMERICA - 800 251 0441 - info@us. com uses Flash and Javascript. Read more about the tools below The Glass Guide™ is a key reference point for all industry professionals wanting comprehensive information on Viridian products. V. 54 1. 01 na 0. The table above shows performance data relating to high performance neutral solar control glasses available on the market with normal lead-in times. Most window system suppliers have total system (frame and glass) tested values. Outperforms tinted glass. 3 Simulations1 Solar Heat Gain Coeffi-cient5 Shading Coeffi- cient2,4 Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 performance of glass products. Laminated products: glass fabricators, inc. 0 A6 YES . Generally, the following four terms are considered very important when it comes to evaluating glass performance: Visible Light Transmittance (VLT) Solar Heat Gain Coefficient (SHGC) Light to Solar Gain Ratio (LSG) U-Value, in both Winter and Summer Tools & Resources. As a result, float glass is produced utilizing the entire specified thickness range. 97 0. Insulating Glass Brochure. 3mm Exterior Glass Interior Glass Visible Light SHGC A leader in tools for the glass industry. 33 0. There are three glass types commonly used for technical glass products: borosilicates, soda-lime silicates, and phosphates. Asymmetrical lay-ups, having two different thicknesses of glass, are also available on request. 59 mm) 1/4" - - 31 32 5 GlasSelect® calculates center of glass performance data using the Lawrence Berkeley National Laboratory (LBNL) Window 5. Clear Glass Resources CSI 3-Part Specifications available on GGI website, RIB (BSD SpecLink), and ARCAT. This performance data is not a commitment for Cardinal to produce. 24 Solarblue® Glass 1/4 6 56 6 6 1. 24 . 4 All performance data is determined using LBL window 7. Read more about the tools below Cardinal's LoĒ³-366 glass is the new standard in energy efficiency. com Insulated Glass Performance Data 1"OA dual seal insulated glass unit using 1/4" greylite 14 glass 1/2" air space 1/4" low E Energy Select 73 glass VLT% RVL% Out RVL% In UV % U Value U Value RHG SHGC SC with argon 7% 4% 12% 1% 0. 45 13 which is the internationally recognised method for describing glass performance. Please navigate with sitemap Sitemap EspaÑol LoĒ³-366 Glass SHGC: 0. 29 . 60 5. 7 mm GLASS 2 Clear (North America) Glass Acoustical Information The acoustical performance of windows and doors is influenced not only by the glass but also by the framing members and construction of the window assembly. At first, it may seem difficult to decide which glass is best for a particular application. This is expressed as a dimensionless number between 0 and 1. STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Glass 1 1/4" (5. Argon is a safe, odorless, colorless gas, which is heavier or denser than air. 27 / U-FACTOR: 0. 2. Annealed glass can be cut, machined, drilled, edged and polished. com Performance Chart Glasswalls Porch Enclosures Glasswalls porch enclosures are unique 3-lite glass and full screen window units designed specifically for year-round porch living. ©2020 Guardian Glass, LLC v. com Performance Values: Color Rendering Index (CRI) – A scale from 0 to 100 percent indicating how accurate transmitted color is when viewed through the window as compared to actual color. 1/8" 35 35 The lower the number the better the glass performance. Energy & NFRC ratings, Glass Performance, Performance Grade, Air Infiltration, Sound Transmission, Altitude Limits, Wind Load tables, and more. Our glass products offer different performance and aesthetic advantages. 19 the better performance. Performance comparison chart Single Glazing Insulated Glass Unit Insulated Glass Unit with EnergyTech on surface #3 Product Insulation Solar Daylight Insulation Solar Daylight Insulation Solar Daylight The lower the number the better the glass. 22 . com or request our Architectural Glass Catalog. Oct 4, 2016 · The Performance Calculator – developed by Guardian’s technical team as part of the Guardian Glass Analytics Software suite and freely available – calculates the light and energy performance of any Guardian® glass, either used as a single sheet or any combination of type and thickness for double and triple insulating glass units. Float glass (also called “flat” glass) that has not been heat-strengthened or tempered is annealed glass. 00 na 0. Our window films are a cost-effective solution and work very well for blast mitigation, as you can see . Being a true continuous process, the glass does not stop flowing, even during thickness changes. The Lower U-values indicate better insulating performance. U-values indicate how well the glass will hold the heated or cooled air. This document provides a performance chart for various types of glass, listing their U-value, R-value, solar heat gain, and visible light transmittance. crisp” aesthetic insulating Low-E glass that o˚ers low to high re˝ectivity and visibility and a low solar heat gain coe˜cient. Glass Business & Discovery Center 400 Guys Run Road Cheswick, PA 15024 1-888-PPG-IDEA www. 24 / TDW: 0. Floor to ceiling windows provide light, transparency and sweeping views of Central Park All performance data calculated using LBNL Window 7. 34 0. 29 1. If you need even more specific information. All tabulated data is based on NFRC methodology using the LBNL Window 7. 6 11. The document notes that based center-of-glass performance for many prospective glazing compositions. National Processing Capabilities . float glass (also called “flat” glass) that has not been heat-strengthened or tempered is annealed glass. 33 1/4 6 68 7 7 1. 4 mil. Oct 18, 2023 · STYLE CONFIGURATION GLASS REFO GRIDS U‐Factor R‐Value SHGC VT CR Northern North‐Central South‐Central Southern Wincore 5400 Series Thermal Performance Chart ENERGY STAR v7. 515 244 4256 fax 515 243 6373 800 532 1506 www. Answering a few questions will help guide you to the right glass type. The Guide includes: Product information and capability updates; Specification assistance information; Performance data PERFORMANCE Windows and Sliding Patio Doors (GI02) There are several characteristics and properties of glass in window and patio door products that directly effect customer satisfaction. The N-Series is a full range of high performance neutral to Color Comparison Chart: Outdoor Reflected Color Transmitted Color Indoor Reflected Color Important Notes Calculations and terms in this report are based on NFRC 2010. 38mm grey 41 5 5 0. Custom IG unit designs can be fabricated with glass thicknesses ranging from 1/8″ to 3/4″ and with airspace thicknesses ranging from 3/16″ to 7/8″ having standard spacer colors of clear, bronze and black anodized, and mill finish aluminum. PPG Residential 3/4" (19mm) Insulating Glass Unit Performance Using 1/8" (3mm) Glass* Glass Designation Construction (Glass-PVB-Glass) Weight Test Standards This table shows data for symmetrical lay-ups. For detailed information on the methodologies used to calculate the aesthetic and performance values in this table, please visit vitroglazings. Glass surfaces are counted from the exterior face of the building. 3030 Email: textures@walkerglass. 4. Noise Reduction Solution Charts Azurlite® Glass — see AzuriaTM Glass PPG Industries, Inc. 800 Park Drive, Owatonna, MN 55060 US | (800) 533-2080 ©2023 Viracon All Oct 10, 2024 · Understanding glass performance begins by understanding some key glass performance terms. 030 P. 9" = 2 lites down (1H) per lite of glass Window height 77" - 84" = 3 lites down (2H) per lite of glass Proview Sash Configuration Window width Up to 31. ANCHORING SYSTEM: The energy performance of architectural glass is measured according to four critical factors: Visible light transmittance (VLT) gauges the amount of natural light a glass transmits into a building. 7 10. 9" = 3 lites across (2V) per lite of glass GSA Performance Condition. 5 software, NFRC 100 – 2010 conditions have been used. Mar 2024; Product performance comparison is to compare similar coating technologies or performance attributes. The table compares laminated glass against the performance of non-LG configurations. com. Noise source levels dB Threshold of hearing 0 Conversational speech 65 Average traffic (kerbside) 70 Busy Float glass manufacturing is a true continuous process. com AGC GLASS COMPANY NORTH AMERICA, A LEADER IN FLAT GLASS AGC Glass Company North America is the North American flat glass branch of AGC, the world’s leading glassmaker. Any given lite or piece of float glass will typically have a very uniform thickness; however, glass by customer orders: cutting the glass to the custom sizes, applying print then heat treating the glass prior to applying a high performance coating. And it provides the highest lists the glass to be used to achieve the upper and lower sound level at the room side of the glass. A triple-layer coating that blocks solar gain, reflects heat, and lets light in. Gas Library ID#9 (10% Air/90% Argon) is used for Insulating Glass units with The bar chart diagram is for indication only, for performance data please refer to the glass performance data tables at the end of this document. Contact sales Performance Data. 6 0. 24 mm) 1/8" 0. 61 5. The higher the number the better the glass. Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustica l wall. Performance documents for altitude limits, NFRC ratings, center of glass, joining window load table, air infiltration, and more. Guardian Glass has developed easy-to-use, advanced software for glass and glazing system analysis. 77 Expert Series: Energy Performance and Low-E Coatings The alternative pyrolytic deposition process takes place as the float glass is made. All performance data calculated using LBNL Window 7. , Montreal QC H1J 1L5 Canada Phone: 514 352. com The performance data below applies to triple insulating glass units constructed with three plies of glass, two airspaces and an interla yer (where applicable). Performance Safety May 13, 2024 · NFRC Ratings Andersen® windows and doors are tested to determine National Fenestration Rating Council (NFRC) certified glass performance ratings. Riot Glass Inc. The data is glass only and care should be exercised when evaluating manufacturer’s published data that the same environmental conditions have been used. The values given are centre of glass values. 2 program (version 5. Adding a frame typically reduces the performance by 3 or more Rw (dB) points. 49 0. We used a live “shot” to test the blast performance of a window film system. The chart includes dual pane and triple pane clear glass with no coatings, as well as glass with Low-E and SunStop coatings. New Acuity™ Glass by Vitro Architectural Glass (formerly PPG Glass) is an affordable low-iron solution available with Solarban ® solar control low-e coatings, offering vivid views with no green cast. Title: GGI Clear 3mm - Double Pane IGU Tinted Glass Performance Data Notes: • Values are center of glass calculated using LBNL Window per NFRC 100, actual values may vary due to production tolerances. 8m and/or the surface of double pane glass has more than 10m 2 . The performance of the interlayers at different temperatures varies by interlayer type. 30 3. 43 / LIGHT TRANS: 66% / All stats A new standard Cardinal introduces LoĒ³-366 (pronounced low E cubed-366), the ultimate performance AX550 Moving Glass Walls (3) AX450 Moving Glass Walls (2) C650 Ultra™ Series Doors (2) V400 Tuscany® Series Doors (2) VX350 Moving Glass Walls (2) A250 Thermally Improved Aluminum Doors (1) V300 Trinsic™ Series Doors (1) V450 HomeMaker Series Doors (1) SystemSelect is a platform that offers interactive courses on architectural glass, metal, and hardware certified by AIA. available here for convenient download in PDF format. For this reason laminated glass is While the primary focus is on residential applications, much of the information can be used to gain a better understanding of glass performance in all types of buildings. This chart is not a recommendation as to products being equivalent in terms of aesthetics or performance. 42 . To compare, the glass with the industry’s highest VLT, Starphire® ultra-clear glass by PPG, transmits Location 6601 NE 112th Court Vancouver, WA 98662. For actual product comparisons, it is recommended to view samples and consult the manufacture Atlantica® Glass 1/4 6 67 7 7 1. Annealing float glass is the process of controlled cooling to prevent residual stress in the glass and is an inherent operation of the float glass manufacturing process. Fit the bill—and the build—with new Acuity™ Low-Iron Glass. 6. Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. 7mm) airspace ] 3/32 2. This Glass Performance Guide provides glass only performance data for a comprehensive range of products. 03 na 0. B. It is important to note that the above listed glass performance will differ to that of a window assembly using these products. SP-A DL SP-A DL,WG DP-A DL SP-A WG DL, FL SP-T WG FL DP-T DP-A WG Minimum pressure of 9 psi (62 kPa) 14 mil. From technical data sheets to complex technical considerations, Vitro is here to help you make an informed decision on the product you choose for your project. Its baseline, Beyond Glass, reflects its core assets: as a Performance Chart of Various Glass Configurations The purpose of this table is to help balance the individual needs of safety, aesthetics, thermal performance and other factors. This represents a sample of possible Performance for Insulating Glass Units of 4 mm Outer Lite + 12 mm Airspace + 4 mm Inner Lite Glass Configuration 4 mm + 12 mm Gap + 4 mm UV % Visible Light Solar Energy U-Values W/m2*°K Reflectance % SF Win-NFRC Sum-NFRC EN 673 LSG Trans % Ext Int Refl %Trans %EN410 SHGC SC air argon air argon air argon SOLARBAN® 90 Quad Silver Neutral Low-E Low-E Glass Our Low-E building glass range efficiently adds to your home’s comfort all year-round. These coatings have a neutral brightness that enhances the appearance of low-iron glass as well as various tinted glass. 33 53 NO NO NO YES NO . 38 53 NO NO NO NO YES . Pfaudler Glass Linings – SGG Midas Gold is a high-performance solar control glass with a regal golden hue. 1 Product name – refer to product for more information. Minimum pressure of 4 psi (28 kPa) 1 2 3a 3b 4 5. As the newly-formed molten glass floats across the tin bath, its upper surface is sprayed with material, typically tin oxide. Download Vitro Glass Literature. SUPERIOR PERFORMANCE INSULATED GLASS UNITS with LOW E GLASS 18/01/24 LoĒ³­366 Glass | Cardinal Glass Industries 1/4 LoĒ³-366 Glass Cardinal LoĒ³-366® glass is the ultimate performance glass. walkerglass. The performance data below applies to triple insulating glass units constructed with three plies of glass, two airspaces and an interlayer (where applicable). ppgideascapes. The performance characteristics of Cardinal’s LoĒ® products are shown on the attached “Insulating Glass Performance Comparison” charts. Coating Considerations Walker Glass Co. 3030 or 1 888 320. 23 . glassfabinc. Examples are spandrel, tinted, southern-facing elevations, coatings, and non-conditioned space behind the glass. Our standard product Pfaudler World Wide Glass WWG is characterised by the wide range of areas in which it can be used. Solarban® 70 glass for annealed applications is applied to Starphire® glass, heat treated applications will require either clear or Starphire® glass depending on manufacturing process. , 9551 Ray Lawson Blvd. Glass Analytics online tools offer a comprehensive suite of engineering and analytical reports that demonstrate the advantages of high-performance glass in building facades. 32 3/16 5 72 7 7 1. All laminated safety glass also meets ANSI Z97. 9" = 1 lite down (0H) per lite of glass Window height 32" - 76. The standard provides a range for the “Design SunGuard SN 68 low-E coated glass provides a beautiful, natural look with balanced thermal performance and a 0. The performance values shown above represent nominal values for the center of glass with no spacer system or framing. GLASS TYPE: SP-Single Pane / DP-Double Pane / A-Annealed Glass / T-Tempered-Toughened Glass. 57 1. (1) Applies to CPSC 16 CFR 1201 and CAN/CGSB-12. Solar heat gain coefficient (SHGC) represents the solar heat gain through the glass relative to the incident solar radiation. Each category serves as a crucial indicator, offering precise insights into the functional attributes of the glass and facilitating effective comparisons for informed decision-making. Please note, the following registered trademarks are the intellectual property of Viridian Glass Pty Ltd. Actual values may vary due to the production process and manufacturing tolerances. SC (Shading coefficient) : The proportion of directly transmitted and absorbed solar energy that enters U VALUE: The measurement of air to air thermal conductance or insulation between indoors and outdoors through the glass. It just might make all other low-e glass obsolete. 2 Nominal thickness – the glass thickness or the makeup of a ThermoTech unit. Performance data is based on representative samples of factory production. When used in conjunction with Low-E glass, argon provides better insulation. STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Glass 1 1/2" (12. 92 Pacifica® Glass 1/4 6 42 5 5 1. Performance for Insulating Glass Units of 4 mm Outer Lite + 12 mm Airspace + 4 mm Inner Lite Glass Configuration 4 mm + 12 mm Gap + 4 mm UV % Visible Light Solar Energy U-Values W/m2*°K Reflectance % SF Win-NFRC Sum-NFRC EN 673 LSG Trans % Ext Int Refl %Trans %EN410 SHGC SC air argon air argon air argon SOLARBAN® 90 Quad Silver Neutral Low-E architectural glass performance data and comparisons energy select | solarshield | stopsol 888-234-8380 | 800-251-0441 | info@us. Technical Service Bulletins. 51 0. This thermal and optical performance data simulation tool utilizes the industry accepted software, Window7. Sound transmission class (STC) and Outdoor/Indoor Transmission Class (OITC) are measured in decibels (dB) and are the standard Temperature Performance Laminated glass may be used in applications where the laminate could be exposed to high and low temperatures. 54 0. 17 0. The following products and combination of products are compared: • IG units with nominal 3mm and 6mm glass substrates; • IG units with clear, green, gray, and bronze non-coated glass substrates; A large amount of glazing configurations means the perfect glass can be yours. 27 3/8 10 57 6 6 1. 46 1. A leader in tools for the glass industry. 38mm bronze 50 5 5 0. 4 mm) 1/2" - - 36 37 6 PERFORMANCE CALCULATOR Page 4 of 5 Color Comparison Chart: Outdoor Reflected Color Transmitted Color Indoor Reflected Color Important Notes Calculations and terms in this report are based on NFRC 2010. 61 0. They can provide 30% or more ventilation area than ordinary windows and patio doors. ARO - 242 West 53rd Street. agc. R-Value: the amount of heat retained by the window. Keeps the view while beating the heat. - need prior Our HP glass packages combine Low-E with argon gas fill and WarmEdge spacer options, providing high-performance insulating glass options to meet your specific needs. 8. For Monolithic Glass Increase glass thickness For Laminated Glass Increase glass thickness Use different glass thickness for individual glass lites, i. Find the perfect glass solutions for your projects today. Heat treating the glass prior to coating allows the glass to absorb the heat more consistently, improving the flatness of glass and optical quality. The first number is the outer glass PERFORMANCE CALCULATOR Make-up Name Glass 1 & Coating Glass 2 & Coating Transmitta Default Make-up 01 SunGuard ®SN68 (North America) on Clear (North America) Calculation Standard: NFRC 2010 Default Make-up 01 GLASS 1 Clear (North America) Thickness= 1/4" = 6mm Clear (North America) GAP1 1100% Air, 1/2" = 12. As the glass subsequently cools, the surface bond solidifies. The adhesion of the interlayer material to the glass acts to firmly hold the pieces of the assembly together even if breakage of the glass should occur. Glass Handling and Safety Guide . produces blast-resistant glass and framing systems for new construction, as well as security film retrofits for existing glass to remain in place. 38 0. Browse the links below to download PDF copies — or request printed copies of select Vitro Glass literature. Energy AdvantageTM Low-E Insulating Glass Performance Data1,10 [ Insulating units constructed of equal glass thicknesses and 1/2 (12. SP-A M . • Argon calculations based on 90% gas fill level. 52 1. The following products and combination of products are compared: • IG units with nominal 3 mm and 6 mm glass substrates; GLASS ONLY VALUES Sound reduction Rw data shown are for glass only test values. It is equal to 86% of the shading coefficient. Glass Performance Data. Ltd. 17) with Environmental Conditions set at NFRC 100-2001. 34 43 0. 38mm green 68 6 6 0. Elevate aesthetics for a modest investment, without sacrificing performance. us. You can now use more glass in a new home, or retrofit our glass in your existing home to maximise views and increase comfort all year Energy Management Performance Data. com Glass Type Visible Light Transmittance (VLT) Solar Heat Gain Coefficient (SHGC) Winter Nighttime U-Value SUNGATE® 400 Coated Glass SOLARBRONZE® + SUNGATE® 400 (3) Clear 58 0. 69 0. 1. Argon fill is 90% and air fill is 100%. We hope you find the guide a useful and valuable resource. • (#) after coating is IGU coating surface number. Laminated products: Film is applied to non glass substrates (if not specifically permissible) - excluding PolyFilms. Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 1/4" (7. 28 0. 9 1. Window height Up to 31. The Low-E and SunStop coatings are designed to improve insulation and reduce solar heat gain. 62 5. One glass side is more than 3. When choosing windows, it can help architects, designers and manufacturers make a more informed decision. 48 1. 9" = 2 lites across (1V) per lite of glass Window width 32" - 42. The U-value of glass is measured by the number of BTUs that will pass through each square foot of area, per degree of temperature difference, from one side of the glass to the other. Call: (360) 334-4107 - Measure of the ability of different structural components to conduct heat. slyf kwrezk cntnp uoewe gnnm yncncpq jgosub lek gzbtjvu gxbsy vfxepta hhdspxu gnhz hdqksp ghzho