Acoustic oitc rating chart pdf It is calculated based on ASTM E 1332 using sound transmission loss data measured between 80 – 5000 Hz. Presentation of Results tested for their acoustic performance. 70 60 --STC38 Feb 22, 2024 · However, even with OITC being the newer creation, the STC rating system is still the preferred rating method among professionals in soundproofing. * * [The data and information set forth are based on samples tested and are not guaranteed for all samples or applications. The updated TMS 302 Sound Standard provides minimum requirements for rating masonry walls for sound transmission class (STC) and outdoor-indoor transmission class (OITC) based on calculation. The OITC rating system is mostly consulted when there are low-frequency sounds involved between 80 to 100 decibels that can't be calculated by the STC rating. Because of the larger range in expected sound, OITC values are determined for lower frequencies as well, in the range of 80 to 4000 hertz. 5 fi berglass insulation batts, ⁄8" None TL-92-618 38 5 designed to deliver noise control ⁄8" Glass fi ber TL-93-325 49 5 in metal stud wall Nov 16, 2024 · It uses varying glass thicknesses and specialized lamination techniques to disrupt different sound frequencies. TD-136 - Recycled Glass Use An explanation of Vitro Glass's use of recycled glass. Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. It provides an estimation of the performance of the wall or floor in certain common sound insulation conditions. Oct 14, 2014 · OITC is similar to STC, but is measured for exterior areas across a frequency range of 80 to 4000 hertz and is therefore more applicable for low frequency noises coming from urban environments, such as traffic or airport noise. STC 43. Today, the OITC rating System is used to assess any barrier meant to block out low frequency sound. Jan 18, 2022 · OITC Test Date Test Number Intercept or Cardinal horizontal slider 6110 6111 6130 6130J 6170 size tested 6040---Operating Style Series Numbers Glass 1 Glass 2 Spacer STC File Name: STC Ratings - Style Line | V250 Due to continual product research and development, details listed are subject to change at any time. This includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. In addition, Each assembly references an RWT (ROCKWOOL test) number. Composite OITC Rating (OITC C) A Minimal 25 B Moderate 30 C Significant 35 D Extreme 40 2. Professionals use the OITC rating System less frequently than the STC rating System. 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. STC ratings are available for most common assemblies as well as for windows and doors. Explore noise reducing windows and doors from Pella. It is used to specify the sound transmission loss properties of exterior Oct 10, 2024 · OITC is a very new rating in the world of acoustics and not all products carry an OITC rating, as they may predate that testing being more commonplace. Nov 25, 2022 · The difference between the sound level inside the window and the sound level outside the window, measured in decibels, is the STC rating. It is called the outdoor-indoor transmission class (OITC). The first column is the rating of the door panel only; tested in a static inoperable condition to determine the sound transmission through the door. 2. These ratings provide an evaluation and rank ordering of the performance of test specimens based on their effectiveness at controlling the sound of a specific outdoor sound spectrum The chart below indicates the STC rating of specially made acoustic doors using various applications of gasketing. The charts include transmission class (OITC), with higher OITC values indicating better sound insulation. To determine the specific STC ratings of glass and a Acoustical Guide – Determining Minimum STC Rating Figure 1. The final STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. 6. Signiﬁcance and Use 4. com 5500 77 Center Dr. 17. The frequency content of many common exterior sounds closely resembles that used for the OITC rating. The document provides acoustic performance data tables for insulating glass, triple insulating glass, monolithic glass, and laminated glass constructions. Acoustic labs conduct the IIC test using a tapping machine with steel The OITC rating is a single number rating calculated from the sound transmission loss values measured from an acoustic test. The STC is determined by comparing its sound transmission curve with a standard reference curve. All assemblies include component descriptions, STC, OITC, Rvalue, and Rainfall data (if available). 5” Acoustics Assembly Number: ISS-00 May 6, 2020 · Outside-Inside Transmission Class Rating used to classify acoustic performance of glazing in exterior applications. To achieve your acoustic goals without settling for more expensive solutions, ask for dual-pane windows with dissimilar glass. Sep 4, 2018 · An Outdoor-Indoor Transmission Class rating specifies noise transmission from outside to inside. Data on acoustic performance of specifi c wall assemblies is available on page 2. These STC and OITC values are common requirements in today’s commercial construction. N/A OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000. The other measure is known as the Outdoor-Indoor OITC: Rw: 1/4″ RAL-TL85-169: 31: 29: 32: 1/2″ Structural Charts. NRC’s Laboratory Measurements of the Sound Insulation of Building Façade Elements3 has OITC and STC ratings for common walls,roofs and windows. Others include the sound transmission class (STC) and the noise reduction coefﬁ cient (NRC). All assemblies include component descriptions, STC, OITC, and R-values (if available). This is typically 1 to 5 STC points depending on the quality of the seal and threshold assembly. 8mm Acoustic / 16 spacer /6mm IGU 38 dB 36 dB 33 dB 8. 1 This classiﬁcation provides a single number rating for The OITC (Outside-Inside Transmlssion Class) rating is used to classify acoustic performance of glazing in exterior applications. Lepage offers a variety of acoustic glass with high ratings. Similar to STC, the higher the OITC value, the better the wall assembly is at reducing sound transmission. Save as PDF 800 Park Drive , Owatonna , MN 55060 US | (800) 533-2080 Windows and doors can help block outside noises whether you live in the city or on a farm. When choosing building envelope designs, designing using the OITC rating Today, the OITC rating System is used to assess any barrier meant to block out low frequency sound. 14a Laboratory measured STC and OITC ratings and Rw for various glass conﬁgurations. determine sound rating improvement with various layers of gypsum board, and (3) incorporate fire rated assemblies, where possible. The second column is the rating of the operable door Type STC OITC: Birkdale Hollow Core: 25 22: Birkdale Solid Core: 32 29: Birkdale 20 min. (4) The higher the level, the greater the product's ability to resist forced entry. 45 43 49 52 53 49 48 56 48 52 49 49 53 34 36 46 49 48 46 49 51 46 49 Oct 18, 2023 · What Is a Good OITC Rating for Windows? Windows are typically the weakest part of a building assembly when it comes to acoustics, which is why you’d want to know the OITC rating. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. 24 Page 1 of 2 Due to continual product research and development, details listed are subject to change at any time rating. The tested STC ratings were less than the manufacturer's published STC ratings. Kingspan panels offer external cladding solutions for roof and walls within the building. Following the guidance of ASTM E1332 (Standard Classification for Determination of Outdoor/Indoor Transmission Class), the OITC rating is calculated within the frequency and options chosen, the actual rating could vary. While you may be familiar with Sound Transmission Class (STC) ratings, there is another relatively new way of measuring sound transmission: Outdoor-Indoor Transmission Class (OITC). E413-87 in an ac oust ical wall. 3-08 Rev H 02/16 Superior Sound Control The STC rating for a basic insulated 2×4 wall with a single layer of drywall on each side is 35-38. S. Class (OITC) 70 SERIES SS 27 23 DS 28 22 3mm/4mm 33 26 Laminated DS-DS/060/DS 35 30 SS 27 23 American Craftsman® Product Performance Sound Transmission Ratings. A SPW using 1/4" laminated glass A SPW using 5/8" laminated glass All tests were performed by Western Electro-Acoustic Laboratory (WEAL), a fully accredited includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. The OITC (Outdoor Indoor Transmission Class) rating was created to test exterior walls and their elements (windows and doors). 3 Acoustic Surfaces In order to foster a pleasing acoustical environment for patients/residents and staff, FGI 2014 sets minimum average room absorption coefficients – rather than specifying specific acoustical finishes Sep 21, 2018 · The OITC rating is used to measure the sound transfer between outdoor and indoor spaces. STC is a method of rating airborne sound transmission performance of a wall or fl oor assembly. 400 Series Frenchwood® Hinged Patio Door Hardware (Trim Set) Exploded View The U. (2) Not available for knock down frame. Example. 5” Acoustics Assembly Number: ISS-00 STC: 43 OITC: 28 Report No. Here’s a look at what you The final STC/OITC rating of the window assembly could vary because of the influence of the framing members and the construction of the window assembly. Actual results may vary. OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500. This occurs for most road Nov 4, 2016 · The OITC rating (referenced in ASTM E1332, Standard Classification for Determination of Outdoor/Indoor Transmission Class) is calculated from the following formula, using a logarithmic summation of individual third OB TL measurements: OITC = 100. Mass and decoupling combined are recommended for increasing the OITC rating of any assembly. N/A. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. An OITC rating of 40 indicates that the assembly provides a reasonable reduction in outdoor noise levels and will provide better sound isolation compared to an assembly with an OITC rating of 30. 24 Page 1 of 7 Due to continual product research and development, details listed are subject to change at any time The STC (Sound Transmission Class) is a rating system for interior building partitions and viewing windows used to categorize acoustic performance. IIC stands for impact insulation class. Glass size and glazing system will aﬀect STC rating. For example, if the transmitter played a sound at 60 decibels and the receiver picked up 30 decibels, the STC rating would be 30. Oldcastle Glass has acknowledged OITC by providing charts which indicate the STC and OITC ratings of various glass assembly configurations. Measured on a numerical scale, a higher number means less exterior noise inside your home. 8mm Acoustic / 16 spacer / 6mm IGU 41 dB 39 dB 35 dB 12. 4. Most buildings need some form of acoustic control to meet various guidelines and statutory requirements. 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. Others include the sound transmission class ( STC ) and the noise reduction coefficient ( NRC ). of about 20 to a high of 55. Mar 26, 2020 · OITC is a commonly used rating for exterior walls. The goal of the project was to test wall and roof assemblies that (1) meet today’s energy codes, (2) determine sound rating improvement with various layers of gypsum board, and (3) incorporate fire rated assemblies, where possible. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. The OITC rating, established in the ‘90s, is newer to the industry and is often overlooked in favor of the STC rating. UPDATED; TD-138 - Heat Treated Glass for Architectural The OITC is the preferred method of comparison of façade elements including roofs for blockage of exterior sounds. The formula to calculate OITC from TL test results is: OITC = 100. The STC rating tested for their acoustic performance. Confirm ratings for specific products with your supplier or JELD-WEN sales representative. Glass size and glazing system will a ect STC rating. Transmission Class (OITC) rating describes its approximate decibel level reduction of sounds such as those of roadway and rail traffic, and of nearby aircraft takeoffs. 3. OITC is one rating system available to help compare the acoustic performance of various wall systems. includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Befitting the therapeutic environment, LEED® for Healthcare awards up to two points for EQ Credit 2: “Acoustic Environment: Exterior Noise, Acoustical Finishes and Room Noise Levels” after rigorous determination of exterior noise levels, acoustic design of the total building envelope, and measurement of “as-built” sound pressure levels. What Is an OITC . It is based on the ASTM E-1332 Standard Classification for Rating Outdoor-Indoor Sound Attenuation. The presence of low-E or argon have negligible effect on sound attenuation characteristics. When choosing building envelope designs, designing using the OITC rating Jan 23, 2025 · Single Number Rating: The higher the OITC number, the better the sound isolation is. OITC testing May 14, 2021 · Desired Acoustic Value. Understanding STC ratings for drywall can be complex. Feb 11, 2025 · A standard dual-pane window carries an STC rating of around 27, but requesting the appropriate options can boost that value up to around STC 34. A brief review of acoustic ratings. J2247-13-303-11-R0 Insulation Included: The final STC rating of a room is a composite, not an individual component calculation. Reality of Sound Transmission Class (STC). 5 outdoor-indoor transmission class, OITC, of a build-ing façade or façade element, n—a single-number rating calculated in accordance with Classiﬁcation E1332 using measured values of sound transmission loss. Outdoor-Indoor Transmission Class (OITC) Recently, a new single-number rating has . These provide acoustic control of the environment within the building giving: Jan 7, 2025 · (1) See size charts in this section for available sizes. 400 Series Frenchwood® Hinged Patio Door Hardware (Trim Set) Exploded View Sound Attenuation Batt Insulation Product Data Sheet Description Acoustic Comparison of Cavity Insulation Types Sound Attenuation Batts (SAB’s) Gypsum Board Insulation Type Test Number STC are unfaced, lightweight, fl exible One layer each side. new way of measuring sound transmission, an OITC rating is HELP ME CHOOSE - ACOUSTIC GLASS The STC and OITC rating measures a window’s ability to block sound transmission. been introduced. J2247-13-303-11-R0 Insulation Included STC 24 / OITC 18 No Insulation STC 29 / OITC 20 R-10 Faced 202-96 Insulation Over the Purlins STC 32 / OITC 22 R-19 Faced Insulation Over the Purlins STC and OITC Ratings for Typical Metal Building Constructions Walls Roofs STC 54 / OITC 39 R-13 Faced 202-96 Insulation Over the Girts 3 5/8” Steel Studs on 24” Centers with R-11 Batts and 1/2 STC OITC Type Glazing (nominal) STC OITC Type Glazing (nominal) STC OITC Type Glazing (nominal) STC OITC Vinyl Acoustic Ratings; Premium Vinyl (V-4500) (Cont'd Its composition helps to reduce sound vibrations, improves STC ratings, and often is used in Oct 10, 2019 · Glass Product Type and Thickness STC Rating OITC Rating Monolithic 3/ 32 ” 26 - 1/ 8 ” 29 - ¼” 31 29 ½” 36 33 Sealed Insulating Glass Units 1/ 8 ” glass + ¼” air + 1/ 8 ” glass 28 26 ¼” glass + ½” air + ¼” glass The OITC rating system was developed as a result of an increased demand for measuring the acoustical performance of exterior building partitions to reduce external sounds. OITC and Soundproofing Windows North America, a rating system was introduced in 1970 under ASTM E 413 “Classification for Rating Sound Insulation. Download. com www. Resource Alert: Find OITC and STC ratings for roof-ceiling assemblies on pages 111–112 of The SoundBook. greenfiber. A high STC rating does not necessarily mean that the same wall will automatically receive a high OITC rating because they are tested for different acoustic sources and sound frequencies. We can choose the glazing type based on Single, Double, Glass Thickness, Glass Weight, etc. Both OITC and STC indicate a wall’s ability to block the transmission of sound from one side of the wall to the other. KEY L = Laminated STC = Sound Transmission Class (ASTM E413) OITC = Outdoor/Indoor Transmission Class (ASTM E1332) Glazing (nominal) STC OITC Ext - Int. 5” Acoustics Assembly Number: ISS-00 OITC Outdoor-Indoor Transmission Class (or OITC) is a relatively new way of measuring sound transmission, an OITC rating is designed to account for sound outdoor sounds which consists of frequencies lower than an STC rating. If thicker glass material is used, the rating can go up to 35. 8mm Acoustic / 16 spacer / 6mm IGU 41 dB 38 dB 34 dB 10. Operable Test (con’t) • In the operable test, the door is in working condition and must open and close • The resulting acoustic rating also highlights the loss of STC between the two tests. -114• glass) with an STC rating of 34. A good level of isolation for walls and ceilings is STC 50 plus. Class (or OITC) is a relatively. *OITC is estimated based on this test. STC OITC Test Date Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Tuscany I V400 updated 09. 4. The target STC values were 45 ‐ 50 and for OITC the target values were 35 ‐ 40. 14 - 10logΣ f10((L f - TL f + A f)/10) (dBA Acoustic Doors Inoperable Test vs. Sound Transmission Loss (dB) 36 33. Sound Control Sell Sheet [PDF] SELECT ALL DOWNLOAD SELECTED. 3 Reduction in sound based on OITC ratings of Pella Lifestyle Series windows with respective performance package compared to a single-pane wood or vinyl window with an OITC of 19. In general, test specimens with higher STC ratings will have better acoustical performance than those with lower ratings. 26 30 26 30 33 33 34 36 37 35 32 32 36 40 43. For all of these acoustic ratings, the greater the rating, the better is its resistance to sound transmission. The TMS 302 Sound Standard provides minimum requirements for rating masonry walls for sound transmission class (STC) and outdoor-indoor transmission class (OITC) based on testing calibrated calculation procedures. The OITC (Outside-Inside Transmission Class) rating is used to classify acoustic performance of glazing in exterior applications. 8mm Acoustic / 16 spacer / 6mm IGU 41 dB 40 dB 36 dB 16. STC OITC Test Date Test Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Trinsic I V300 updated 04. Sound Transmission Loss (dB) 48. Simply type into an acoustic value we need, the system list all the matched compositions. 0024 greenfiber. 14 − 10log 10 å f 10((L f-TL f +A f) / 10) Where: These ratings are all single numbers used for comparison of various assemblies. This metric measures the sound levels for interior building partitions where the main sounds are people talking or office equipment. STC and OITC are independent unrelated tests which do NOT use a common numbering system for results. This AIS Glass’ software helps you to calculate the acoustic insulation & configurations like glass thickness, thermal breakage, etc. The triple-insulating glass units are constructed with three lites of glass, two airspaces and an interlayer (where applicable). 03. Opening stc_rating_chart. they let pass through. info@greenfiber. 1/8" overall - 1/8" glass 33 26 30 This Acoustics Wall Assemblies Catalog provides a comprehensive list of wall assemblies tested for their acoustic performance. The STC rating for a six inch concrete sub-floor is 52-55. [ss] [ss] [ss] [ss] wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi-wpi- Jun 28, 2016 · Indow Window Page Field Sound Transmission Loss Testing June 28, 2016 2 microphone type 377B20 (S/N: #LW131539), as well as Larson Davis calibrator type 200(S/N: #11875). Similar to STC ratings, OITC ratings provide information on how well a barrier blocks sound, and should be taken into consideration as you shop for soundproofing the rating, and Table 3 shows an example worksheet for calculating OITC. May 6, 2024 · ASTM E90, the same test method used for STC ratings, is used to calculate OITC ratings, but the OITC test includes a wider range of decibels between 80 Hz and 4,000 Hz to represent outdoor sounds such as car wheels on a road and engine noises. Type JELD-WEN Custom Clad Casement 1/8" - 1/8" 28 23 The sound transmission class is a single number rating providing a convenient way to describe the sound transmission loss (TL) values. Outdoor-Indoor Transmission Class (OITC) is a single-number rating system for acoustical performance, developed primarily for the typical exterior noise spectrum. 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 thicknesses. It uses a specific decibel (Db) range (80 Hz to 4000 Hz) which makes it a better measure for low sound frequencies such as road noise. The target STC values were 45 - 50 and for OITC the target values were 35 - 40. What is a good OITC rating for windows? So, OITC is the ideal measurement for Peerless acoustic windows & doors. The STC measurement has been around since 1961, so for a long time, that was the only rating to measure how windows performed acoustically, in 1990 the OITC measurement came about as a way to rate outside noise. As with STC ratings, the higher the OITC number, the more sound resistant the product is. Comparing STC and OITC Ratings of Different Window Types 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. The same process is used to determine STC ratings for doors. The ﬁgures in Column 3 for theA-weighting adjustments are taken from ANSI S1. For example, if your neighbor has a subwoofer-equipped sound System, you may want to consider OITC ratings for all of your barriers, interior and exterior. Although very similar, the OITC rating system is aimed at lower frequencies, such as construction work, rumbling engines, low-flying planes, and car horns, and it utilizes a wider frequency How to calculate an STC or OITC rating; STC versus OITC. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. Acoustic glass windows offer some of the highest STC and OITC ratings available and are an excellent choice if you require the utmost in sound insulation. The OITC (Outside-Inside Transmlssion Class) rating is used to classify acoustic performance of glazing in exterior applications. Two common ratings for windows and doors are the Sound Transmission Class (STC) and Outdoor-Indoor Transmission Class (OITC) Ratings. 8mm Acoustic 48 dB 46 dB 42 dB Triple Glazed RUnits w+Ctr 800. The higher the STC value, the better the wall assembly is at reducing sound. ] May 22, 2022 · Thanks, Terry, for the helpful information. Other ratings may be computed using the same worksheet subsituting the appropriate data for the rating instead of the sound transmission loss. transmission class (OITC), with higher OITC values indicating better sound insulation. 1 mm STC Ratings Chart. Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. Single Number Ratings –OITC Intent: a single number rating to assess the isolation provided of different assemblies specifically for traffic and aircraft noise. 228. The U. TLs are measured at somewhat lower frequencies than in STC testing. Suite 100, Charlotte, NC 28217 PM-6. In the case of both STC and OITC ratings, a higher the rating, the better as it indicates that less noise is detectable. The performance data below applies to triple-insulating glass units. A good OITC window rating is 30+ and usually comes with thicker glass (½” or more) and added glazing for additional sound reduction. Description. Fire Rated: Acoustic Ratings - Interior Doors: Stile and Rail Interior Doors OITC is one rating system available to help compare the acoustic performance of various wall systems. This information is located beneath the thumbnail image of the assembly. Both OITC and STC indicate a wall’s ability be used to help achieve acoustic requirements. (3) Published performance data is for single unit only. Outdoor-Indoor Transmission . The STC rating has been around for decades and is often relied upon as the go-to rating for soundproofing a building. One thing that I’m not clear on: how would I know how high of an OITC rating I need? I’m guessing that I would use a sound/decibel meter to measure the undesired noise, estimate a desirable/tolerable noise level (in decibels), and calculate the difference (bad noise decibels minus good noise decibels, if you will). The Outdoor–Indoor Transmission Class (OITC) is a standard used for indicating the rate of sound transmission from outdoor noise sources into a building. OITC. How the OITC Rating is Measured Like the STC rating System, OITC measures sound intensity Stc rating glass chart acoustic. Acoustic performance of a wall assembly can be affected by workmanship and attention to detail while constructing a wall. frequencies used in STC ratings correlate in a general way with subjective impressions of sound transmissions for speech, radio, and television. Final file including Rw, OITC, STC, and DB value under different sound Frequencies. IIC. 8mm Acoustic / 16mm spacer / 16. Calculated by using the sound transmission loss values in the 80 to 4000 Hz range as measured in accordance with ASTM E-90(09). The STC rating has been in existence for many years and is based on speech sounds. [37] three different glass configurations. For example, if your neighbor has a sub woofer-equipped sound System, you may want to consider OITC ratings for all of your barriers, interior and exterior. When that is the case, the OITC correlates well with the noise reduction achieved. This rating increases to STC 42-45 with steel studs. Products like GenieClips® RST, HushFrame Raft, Green Glue Compound in tubes or pails are most commonly used to improve OITC ratings. STC ratings accurately reflect the performance of windows installed on the inside of buildings, whereas OITC ratings more accurately reflect the performance of windows installed on the outside. Use OITC when considering intrusion of noise into a building from roads,trains or aircraft. Refers to a window manufactured by Soundproof Windows, Inc. The STC rating for a basic wood structure floor/ceiling is 40-43. ” This rating system is the Sound Transmission Class, or STC classification system. Dissimilar glass. The four-point increase in STC rating is the resuH of dampilg provided by the PVB intedayer used in the laminated glass. bawd gwuiv fyycs efgvub wkagql plgek nntkxsu azw njyfcdu llmza hnycsnd rkgz dzdr ynofb wtvcc

Acoustic oitc rating chart pdf. Outdoor-Indoor Transmission .