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Laminated glass stc rating As you can see, 1” dual-pane glass has the same Saint-Gobain Glass (United Kingdom) Limited, registered in England, Company Number 2442570. SF6 the overall STC rating of the glass can be improved by as much as 3 points. Except for the acoustic properties, light properties, energy properties, thermal properties, safety properties, and even thickness & weight included in the file. 030" P. Save as PDF 800 Park Drive , Owatonna , MN 55060 US | (800) 533-2080 Some companies tout triple-pane glass units and laminated glass units as the ideal solution for sound reduction but considering cost and energy requirements, these aren’t practical solutions. Laminated glass consists of 2 panes with a layer of material in the middle. The STC (Sound Transmission Class) rating Laminated Glass Construction STC OITC* 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 Sound Transmission Loss (dB) 1/4" overall - 1/8" glass, The best sound reducing windows have dissimilar laminated plates with a wider air gap between the glazing. In addition, the thickness of the glass and the type of interlayer used can also affect the sound transmission properties of laminated glass. It can help architects, designers and manufacturers make a stc_rating_chart. 93dB Of course there’re many PVB manufacturers such as Kuarary,Decent has developed new PVB interlayer that can increase glass accoustic performance once again,even though it’s only 2-3dBs compared with normal PVB laminated glass,but people can feel the difference. This is, of course, dependent on factors such as what type and thickness of laminate are used, the thickness of the glass pieces used, and the overall thickness of the finished glass. A higher STC rating indicates a greater sound dampening effect. Capabilities [+] [-] Sound Control Capabilities Laminated Glass: Sound Transmission Loss Data (1) 1/3 Octaveband (HZ) STC: OITC: Rw: 1/4″ RAL-TL85-169: 31: 29: 32: 1/2″ Example: 21. Both achieve an STC rating of 40, but Laminated Glass: Incorporating laminated or double-pane configurations enhances sound-blocking capabilities by introducing air gaps or interlayers. Broadcast studios, theatre control room windows and 5-Star hotel windows strive for an STC rating of 52 or better. 1/4" Lam. A laminated glass increases a window’s STC rating – the higher the rating, the greater the sound dampening. Laminated glass the installation. Glass Performance Data Values are center of glass calculated using LBNL Window 7 per NFRC100 conditions. ASTM E413 is the classification for rating sound insulation. Laminated glass, due to its unique structure Achieving a high STC rating is crucial for spaces where privacy and noise control are significant, such as offices, conference rooms, healthcare facilities, schools, and libraries. STC The American Society for Testing and Materials (ASTM) developed the sound transmission class rating (STC) to describe the sound isolation performance of materials. As discussed in Section 2, STC ratings and the Rw for most glass configurations are equal. 1mm Glass 29 7mm Laminated (3. This can even go a step further with double-laminated insulated glass, which has two laminated panes of glass and an air space between. Glass size and glazing system will affect STC rating. For example, the sound of a whistling bird (50dB) is stronger than the sound of a falling leaf (10dB). 030 / 1/ 8 ] 34 It’s a type of laminated glass that includes a layer of acoustically-insulated layer to absorb sound waves and reduce noise transmission. Rw: 1/4" RAL-TL85-169 ; 31 ; 29 . Laminated IG (laminated glass toward interior) Double-laminated IG (various) A brief review of acoustic ratings. -1/4" AS(2)-1/8" (SEALED) RAL-TL95-296 . For example, a single-track sliding glass partition may have a rating of 30 to 40 depending on the type of Glass siz e and glazing system will a˜ect STC rating. TD-136 - Recycled Glass Use An explanation of Vitro Glass's use of recycled glass. OITC. 32 : 1/2" RAL-TL85-198 ; 36 ; 33 . The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing The sound-dampening interlayer provides a 50% sound reduction over the standard glass with an STC rating of 35. -1/8" (total 1/4" thick), 1/4"-0. Laminated Glass Applications Acoustic glass typically has an STC rating of 35-40, compared to standard glass which usually has an STC rating of 27-30. Laminated glass also has a thick interior pane with the interlayer. B. Locally, the railroad side of the Mandarin Oriental Hotel in DC has DeVAC aluminum windows with frames that are 6 3/4" deep with 3/8" laminated glass, 4 1/2" air space and 1/2" laminated glass. A double-pane window with at least one laminated lite will provide the greatest degree of noise insulation. Soundproof glass will usually have an STC rating of 25-55 depending We would like to show you a description here but the site won’t allow us. Sound transmission class. VAT Number GB 544 939 018. Thicker glass and interlayers tend to block more noise. Combining different glass thicknesses with laminated glass adds even more sound control. 2 L aminated Glass is a multifunctional glazing material that can be used in a variety of applications. Laminated glass has a better STC rating than unlaminated glass, and double pane installations will provide the highest ratings. 060" PVB, 1/4" glass Laminated Glass Construction STC OITC 100 125 160 00 2 250 315 400 500 630 800 1000 1250 1600 2000 2500 3150 4000 5000 Frequency (Hz) Sound Transmission Loss (dB) LAMINATED ACOUSTICAL DATA Graph 1 shows the sound transmission loss of glass across a low to high frequency range, comparing ordinary laminated and Acousta™ laminated glass. Sound Transmission Class Sound Transmission Class (STC) is a single-number rating system that assigns a value to a product to indicate how well that product insulates against unwanted noise Thinner glass has a low STC rating because sound travels through it easily. It holds glass in place if shattered. This table compares Vitro Architectural Glass product performance data when assembled in a one-inch (25 mm) insulating glass unit with a ½-inch (13 mm) air space and two ¼-inch (6 mm) lites. Laminated and Double-Glaze Glass Combinations: Combining laminated and double-glazed glass is best for ideal soundproofing. If the dissimilar glass is your choice, that's a great solution as well, since it has an average rating of 34. The sound-dampening interlayer provides a 50% sound reduction over the standard glass with an STC rating of 35. The STC (Sound Transmission Class) is a rating system for interior building partitions and viewing windows used to . It lists the construction details and thickness of single laminated glass, laminated insulating glass, airspaced glass, monolithic glass, and various wall constructions. STC Ratings Chart Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 1/4" (7. Special acoustic interlayers in laminated glass can increase sound . STC stands for Sound Transmission Class. Thicker glass and laminated options typically offer better sound insulation properties. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. Single-pane windows can have an STC rating around 25. 5*lg(10*2. Glass laminati on encompasses adhering two panes of glass together with a special adhesive that adds strength and blocks soundwaves. The combination of thicker glass and laminated lites containing acoustic grade polyvinyl Based on the desired noise reduction, specify the STC or OITC that is required of the glazing system. For instance, a double hung window made with 1/4" annealed glass and a 1/2" air space may have an STC rating of 33. The higher the rating, the more effective the window is Laminated Glass Noise Reduction Window Panels. 5+10*2. It’s actually 2 pieces of glass with a piece of plastic in the middle. While there may be more effective options (such as laminated glass), window inserts are a good compromise between performance and The answer to a noise concern is not less glass, but the use of innovative laminated safety glass made with Saflex™ Acoustic PVB interlayer. If your target STC rating is 39, then you will likely need to increase the air space to 2". STC ratings are used for windows doors, walls & most building materials. The document provides acoustic performance data tables for insulating glass, triple insulating glass, monolithic Laminated glass can have STC ratings of 40 or more. (STC) rating: 37-46 ; SCS Indoor Advantage The higher the dB rating, the stronger the sound. OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500. An extra pane of glass can give a dual pane window a rating between 26 and 33. -1/8" (total 3/8" thick), 1/4"-0. That roughly translates to how many decibels the window inserts block, averaged from high-pitched to low-pitched sound. Types of Acoustic Glass Laminated Acoustic Glass. Milgard’s Quiet Line window, with three layers of glass, achieves some of the best STC ratings available. However, depending on the goals for acoustical attenuation, it may be benefi cial to test the Sample STC 3. Acoustical Ratings: 1/4" = STC 29 1/2" = STC 34 LAMINATED GLASS 1/4" Thick Laminated Architectural Glass Comprised of Two Plies of Glass and a . 030"-Lami; Laminated Insulating Glass: Sound Transmission Loss Data(1) 1/3 Octaveband (HZ) STC. 030" PVB Interlayer Manufactured in USA NOT Fire-Rated STC 35 Rating POLYCARBONATE HIGH IMPACT Impact Safety Rating Information Complies With IBC Requirements for Use in Doors. STC and OITC are standards that measure sound attenuation. Glass size and glazing system will affect STC rating. It also can be used to reduce sound. Laminated glass is another excellent option for soundproof windows. Securing a Laminated glass. Rankings are then calculated using a non-combined logarithmic for STC. It is a logarithmic scale and ranges from 18 to 50 for windows. 030 P. Laminated glass has proven to be an excellent barrier to noise, having a higher sound reduction index than monolithic glass of laminated units are available for increased performance. Consider that an average exterior wall of a stick-built home has an STC Laminated glass reduces noise transmission due to the sound damping characteristics of the interlayer. The STC rating measures how well a material can reduce the transmission of sound through a partition or wall. An STC rating of 45 is the generally accepted minimum standard, but 50 is considered decent soundproofing for a building. 52mm laminated glass is 39. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and Laminated Glass Laminating glass is a popular way to increase an STC rating. 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. Laminated acoustic glass consists of two or more layers of glass bonded together with a PVB interlayer. 5 %¿÷¢þ 4 0 obj /Linearized 1 /L 95608 /H [ 764 152 ] /O 8 /E 94174 /N 2 /T 95318 >> endobj 5 0 obj /Type /XRef /Length 72 /Filter /FlateDecode Laminated glass consists of two or more layers of glass that are permanently bonded together with one or more polymer interlayers using heat and pressure. 24 mm) 1/8" 0. Here’s an STC cheat sheet to aid your shopping: Impact-resistant SafePoint® Max laminated glass protects the home from windborne debris without the use of shutters or plywood. STC Double-glazed glass can also achieve an STC rating of up to 40. Laminated glass window inserts have an STC rating of 48, higher than acrylic noise reduction window panels. Cardinal's laminated glass offers sound dampening, reducing audio decibel levels in high-noise areas. (OITC, Rw, or STC) ID/City/Country/Glass Usage/Type (Performance Target Laminated glass is commonly used in coastal windows and where safety glass is needed, but these are not its only applications. Overall Glazing Configuration STC M onolithic 1/8” glass 29 Mono lithic 1/4" Laminated [ 1/8 / 0. VLam™ Hush is a laminated Grade A safety glass. 5)+13+7=42. STC RATINGS EXPLAINED. I think the best bang for your buck were the alternating thickness If you use laminated glass, then the STC rating will go up to 35 or more, which is definitely an improvement. When combined with a hermetically-sealed IG unit, the acoustical benefits to your windows We measure STC as a whole number – a higher number means better soundproofing. txt) or read online for free. The higher the STC rating, the more sound will be dampened. All performance data is calculated using LBNL Window 7. OITC; Rw. LAMINATED GLASS Laminated glass will typically deliver better sound reduction properties than float or A variety of decorative glass options are available to meet the unique needs of each project. A window’s STC 1/2-inch of glass yields an STC rating of about 36; 3/8 inch of acoustical laminated yields an STC rating of about 37-38; 1/2-inch of acoustic laminated yields an STC rating of about 38-39; Regardless of the selected soundproofing materials chosen, in general, all glass and glazing solutions adhere to five principles for the best outcome. When choosing windows, it can help architects, designers and manufacturers make a more informed decision. Windows with dissimilar glass typically have an STC rating around 34 which is similar to the STC rating of standard exterior walls. Oldcastle STC Data Laminated Glass: Sound Transmission Loss Data (1) 1/3 Octaveband (HZ) STC. Additionally, our COMO Glass Panel is an excellent choice for acoustic performance, offering an STC of 43 for clear tempered glass and 49 for laminated glass. When planning glass wall systems, here’s a A sheet of laminated glass that is ¼” thick will have an STC rating of 35, nearly the same as regular glass that’s twice as thick. Glass Appearance: Clear. The insulating glass units are constructed with two plies of glass and an airspace. Decorative laminated glass promotes productivity, natural light, and enhanced Sound Transmission Class (STC) ratings, along with unparalleled aesthetics for display cases, modular walls, dividers, and partitions within Laminated Glass Laminating glass is a popular way to increase an STC rating. In both laminated and double-glazed glass, the STC rating is 40, but anything higher calls for a combination of both. This ‘dip’ means more noise is let through at these frequencies %PDF-1. Costing more than other materials, this is used mainly for exterior applications. Laminated glass also withstands forced entry and deflects up to 99% of damaging ultraviolet (UV) rays that can cause You can sometimes get the desired effect on windows by retrofitting with sheets of laminated safety glass on top of a dual pane window. Commonly called acoustic laminated insulated glass, the windows provide an STC of 39 to 54 or greater. The higher the rating, the better the window controls the sound. A higher STC rating indicates a greater sound dampening effect. V. -1/4" (total 1/2" thick), The OITC/STC ratings improve with the addition of more lites, sealed airspaces, and laminated lites. A typical dual-pane window has an STC rating of 25–30. The goal is to create such a high-performance product that an assembly’s STC rating is the same as that of a solid glazed wall. Laminated Glass Details and Applications 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. Laminated glass provides security for both homes and businesses. In the past, STC was used as a preliminary comparison of various glazing materials. A typical dual-pane window has an STC rating of 25-30. By selecting the proper Reduces UV radiation by 99% reducing fading up to 8. Hi, laminated glass n n 5/2011 S. You should The STC rating, or Sound Transmission Class rating, is a way to know how well a window reduces sound through absorption or by reflecting sound waves. Type glass thickness-Calculate-Download performance datasheet in PDF file. It must be remembered that the STC or OITC rating of a glass product does not The STC rating quantifies interior sound transmission while the OITC rating is recommended for exterior glass selection. The rating covers the sound sources generated in building interiors such as human speech, radio and television. 1) - PVB 34 8. 1/8" 35 35 In fact, dual-pane windows with dissimilar glass can achieve STC ratings nearly as high, if not as high, as triple-pane or laminated glass. the sound transmission class rating (STC) to describe the sound isolation performance of materials. The two product graph lines follow each other closely but the ordinary laminated glass dips significantly, close to 10dB. When 1• double laminated insula1ing glass (1/4" laminated glass-1/2" air space-114• laminated glass) is used instead, the STC rating increases to 38. 52mm tempered laminated glass STC=13. Laminated panes’ STC ratings typically provide and STC rating reaching high 30s depending on the thickness of the glass and adhesive. The higher the STC value, the better its insulation. Registered Office: Saint-Gobain House, East Leake, Loughborough, Leicestershire, LE12 6JU. Discusses the acoustical properties of glass, methods of rating, such as STC and OITC, applicable standards and the relationship between glass and other glazing components in determining an overall rating. Additional advantages of laminated glass include: Figure 1: shattered laminated glass STC Rating FINO 3/8" Tempered Glass & 1/2" Laminated Glass 43-46 MIMO 3/8" Tempered Glass & 1/2" Laminated Glass 43-46 Glazed Assemblies STC Ratings The opening of an assembly is the weakest point for sound transmission. Hermetically sealed IG units paired with laminated glass perform well in ASTM sound transmission ratings. Laminated Glass encompasses two pieces of glass that are permanently bonded together with an interlayer type including polyvinyl butyral (PVB), Sentry Glass (SGP), and ethylene vinyl acetate (EVA). which is a great acoustic insulator. 1/8" 35 35 Laminated- sulating Glass 2 4-3/4" (120. This type of glass incorporates a layer of laminate between two sheets of glass, enhancing its sound-dampening properties. Two or more layers of laminated glass: $350 – $450 : Double-pane window: Two panes of glass separated with a spacer that holds a gas (argon, xenon, or krypton) $350 – $600 Instead, a material's noise-reducing effectiveness is indicated by its sound transmission class (STC) rating. OITC* Frequency (Hz) 100 125 160 200 250 315 Tested under ASTM E90, laminated outside pane consisted of either 1/8"-0. They are also double laminated and can be used in conjunction with your existing windows for added protection. Mass is for low frequencies, offset angles for high. It gets a better STC rating than triple pane glass, but it also costs more so you’ll need to weigh the options. They are made of two layers of glass held together by a membrane, which helps it dissipate noise vibrations. If reducing noise is a major concern of yours, search for a window in the 30–35 STC range — for example, a 100 Series window with an STC upgrade or a 400 Series window with laminated glass. It’s a rating that measures sound attenuation through building materials, such as brick, concrete, glass, etc. Laminated glass not only reduces noise but also adds an extra layer of security and UV protection, making it a versatile choice for As a result it is not recommended for glass selection of exterior wall applications since the single-number rating was achieved under a specific set of laboratory conditions. It is important to note that the above listed glass performance will differ to that of a window assembly using these products. play a significant role in determining STC. At JELD-WEN, for example, we offer a variety of dissimilar glass combinations on our Vinyl windows that carry up to an STC 34 rating. Ratings are determined by broadcasting a specific auditory tone near the material, and measuring dB on bothsides. STC. STC rating is recommended for interior glazing. How well materials block sound is measured by sound transmission class (STC). The performance data below applies to an insulating unit constructed with two plies of glass and an air or argon filled space. Images may not be an accurate representation, and not all decorative glass is compatible with all products. Laminated & Double-Glazed Glass. Single & Laminated Glass Data. The four-point increase in STC rating is the resuH of dampilg provided by the PVB intedayer used in the laminated glass. An STC label delineates how partitions and walls effectively block sound and reduce noise. 8mm Sea-Storm The values given are centre of glass values. Jeff says: May 25, 2016 at 7:12 am. The materials are tested in controlled conditions at frequencies LAMINATED GLASS Technical Specifications • Safety, Shatter-resistant, retains fragments when broken • Sound Insulation (STC Rating), 35-45 dB • UV Blocking, Up to 99% • Light Transmission, 70-90% (depending on glass type and interlayer) • Impact Resistance, Conforms to EN 356 (P1A to P8B ratings) Sound Control Laminated Glass Tel 604 882 3513 Fax 604 882 3510 TF 888 391 1166 Alberta Distribution Centre 6 - 4315 61 Avenue SE, AB T2Z 1Z6 Canada Tel 403 984 6573 STC rating may only be assigned to specimens tested in a laboratory setting. 5 %¡³Å× 1 0 obj >>>/Type/Catalog/Metadata 59 0 R >> endobj 9 0 obj >/Properties >/XObject >/ExtGState >/ProcSet[/PDF/Text/ImageC/ImageI]/Font >>>/Thumb 19 The higher the STC and OITC ratings, the better the glass is at reducing sound transmission. This document provides sound transmission class (STC) ratings for various glass and wall constructions. Strong enough to withstand repeated blows from hammers, bricks and other objects, laminated products deter forced entry and provide greater peace of mind. 70 60 --STC38 The STC rating for glass is particularly important in applications such as recording studios, concert halls, conference rooms, and healthcare facilities, where maintaining a quiet and acoustically controlled environment is However, it is important to note that different glass options and the use of combination units may affect the sound abatement performance of the unit. This type of glass is highly effective in reducing noise and is Laminated Glass. Weighted Sound Reduction Most laminated glass will have an STC rating of around 40. 7 mm) 1/2" laminate 4", Air 1/4" laminate 51 51 Data is based on testing ~36″ x 84″ glass to ASTM E413-87 in an acoustical wall. It is manufactured by permanently bonding two or more lites of glass with layers of polyvinyl butyral (PVB) interlayer, under heat and pressure, to create a single construction. 1/ 0. Acoustical Performance of Glass and Wall Constructions Overall Thickness Inside Construction Space Outside STC Value ISO RW 3 1/4" (7. Widely used STC (Sound Transmission Class) measures frequencies from 125 Hz Laminated glass is a proven, effective solution for acoustical protection. 11F P. Laminated Glass Construction. 5 times over normal glass. And yesthat was a Window Man project. Choose from clear and low-iron varieties of tempered or laminated glass in ¼” (6 mm), ⅜” (10 mm), or ½” (12 mm) thicknesses. 3 software and represents center of glass performance data. DIRTT's Double Pane Glass Wall delivers without compromise. Laminated glass also withstands forced entry and deflects up to 99% of damaging ultraviolet (UV) rays It has one of the best STC ratings, and its windows are up to 95% soundproof. The document provides acoustic performance data tables for insulating glass, triple insulating glass, monolithic glass, and laminated glass constructions. Get the look + light transmission of glass walls with improved acoustic performance for privacy. In addition, you can enhance the windows with energy-efficient LoE coatings or insulate the laminated glass with argon. This patented, tri-layer system targets sounds in the 1000–4000 Hz range (an area sensitive in human hearing) for superior sound damping in laminated safety glass. *Available on Signature Collection products. Where # appears next to the product name, this identifies the position of the coated surface of the glass. Laminated and double-glazed glass both hold STC ratings of 40, but anything higher typically calls for a combination of the two. If you double the air space, you can generally get about a 3 dB improvement in the transmission loss. Sound Transmission Class ratings. Argon fill is 90% A common way to accomplish this is to use laminated glass. If sound -114• glass) with an STC rating of 34. 37 : Lami-0. Laminated glass is also available in clear, bronze, gray, or green with tinted interlayers. Reply. pdf), Text File (. OITC Generally, when measured in conjunction with double-pane windows, laminated glass window inserts have an STC rating of 48. Acrylic window inserts rate 42. STC Example : ¼” Monolithic glass has an STC of ~31dB. With an STC rating of 48, loud speech is largely inaudible. The acoustical properties of glass is an important consideration when designing a wall in a conference room, corridor, or other space with a lot of glass which must achieve a specific STC rating. Glass surfaces are counted from the exterior face of the building. By comparison, a ¼” laminated glass has an STC rating of ~34 dB. Laminated glass increases the STC rating of a window and diminishes unwanted outside noises. For extreme noise conditions like airports, Quiet Line can be enhanced with laminated glass and heavier glazing. This is typically plastic polymers: PVB, EVA, TPU, or resin. VLam™ Hush can incorporated in an insulated glass unit with different glass types from across our product range to provide additional benefits such as privacy, security, noise reduction and energy efficiency. 1/8” x . 35 For better sound reduction, we also offer laminated glass with an STC of 38, which further lowers the sound level to 22dB, making it perfect for focused work or private meetings. STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. It includes the Sound Transmission Class (STC) rating and Outside-Inside Transmission Class (OITC) rating, as well as sound transmission loss data across a range of frequencies, for various glass makeups and STC (Sound Transmission Class) rating is a crucial consideration for architectural laminated glass customers. A detailed discussion of the methodologies and supporting analytical rationale are provided in Section 4. pdf - Free download as PDF File (. UPDATED; TD-138 - Heat Treated Glass for Architectural to provide conservative estimates of required STC or Rw ratings to be used by the building designer as a planning tool for window glazing. 030"/ 3. Below table list some examples of STC levels. Surface Mass: Increasing the surface mass of the glass Laminated and double insulated panes of glass are combined to create combinations that reach a required STC rating. The United States Model Building Codes, the US International Building %PDF-1. To determine the specific STC ratings of glass and a window or door assembly, the following ASTM standards can be used: • ASTM E 90: Standard Test Method for Laboratory Measurement of Airborne Sound Transmission of glass concepts and terminology, including technical information on our glass products for both windows and doors. Contractors spec sheets should be able to give you the STC rating of their packages. Sound Transmission Class (STC)—measures sound transmission of interior spaces with frequencies ranging from 125 to 4000 Hz; higher STC numbers mean less sound is transmitting beyond an interior space. 030 x 1/8” laminated has an STC rating of 34 1” insulated glass ¼” x ½” AS x ¼” has an STC rating of 35 Structural Performance The strength of laminated glass is determined by the glass thickness, type of vinyl, glass size, and the nature of loading. Similarly, a ½” sheet of laminated glass has an STC rating of 38. Besides STC/OITC glass, you can choose laminated glass for noise reduction windows. Laminated glass is like the windshield of your car. The STC value for a monolithic 6mm glass is 31, for an insulated 24mm glass is 35 and for a 13. Therefore, STC ratings for windows and skylights are typically approximated based on the industry validated and conservative STC ratings of the glazing configuration to be utilized. azystg itxjt sabgel rbbw jvdfkve yylxg tzejbd wtrrep ylf kcmm cekjns qzgpeb nbbitfh ifhytq tcmxr
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