Oitc rating chart pdf 2020 This AIS Glass’ software helps you to calculate the acoustic insulation & configurations like glass thickness, thermal breakage, etc. TD-136 - Recycled Glass Use An explanation of Vitro Glass's use of recycled glass. W-HG-2. gov for Energy Star guidelines. com. OITC Rating The Outdoor-Indoor Transmission Class (OITC) is calculated by subtracting the logarithmic Outdoor to Indoor Sound Transmission Class (OITC) The OITC rating is typically applied to façades (exterior walls) and façade elements (windows and doors) exposed to transportation noises. Equation 2 is the OITC equation for clay masonry (ref. The first measure of acoustic performance is referred to as the Sound Transmission Class or STC. com 5500 77 Center Dr. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. been introduced. How the OITC Rating is Measured Like the STC rating System, OITC measures sound intensity 400 Series Frenchwood® Hinged Patio Door Hardware (Trim Set) Exploded View As the table shows, a single pane 1/4” annealed curtain wall window has a STC rating of only 31 and an OITC rating of 28. OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000 2500. Thermal performance of . Thickness. What is Outdoor-Indoor Transmission Class (OITC)? OITC is a measurement that indicates the rate of transmission of sound between an outdoor and indoor space. 45 43 49 52 53 49 48 56 48 52 49 49 53 34 36 46 49 48 46 49 51 46 49 Ratings derived from non-operable assemblies shall only be used for experimental purposes and are not part of this document. 3. All sizes and glass types are tested for air/water/structural and impact-resistance. Suite 100, Charlotte, NC 28217 PM-6. J2247-13-303-11-R0 Insulation Included The document provides acoustic performance data tables for insulating glass, triple insulating glass, monolithic glass, and laminated glass constructions. Lepage offers a variety of acoustic glass with high ratings. The maximum deficiency at any one frequency must not exceed 8. (OITC 37) STC (OITC 39) STC (OITC 39) For more information visit www. Oldcastle Glass has acknowledged OITC by providing charts which indicate the STC and OITC ratings of various glass assembly configurations. 3: Argon. If you have more questions regarding this product, please visit your local Home Depot or call our Solution Center at 888-888-7020 for more information. hmfexpress. 24: 57. The STC rating for a basic wood structure floor/ceiling is 40-43. EZ LT 12 A 2 A 1 E 4 5 A A Component STC. N/A. -Megan The STC and OITC rating measures a window’s ability to block sound transmission. This rating is based on the difference between the overall A-weighted sound level of the sound spectrum given in Table 1 and the overall A-weighted sound level of the spectrum that results from arithmetically subtracting the transmission loss or noise Aug 8, 2022 · 4. includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. The STC wall rating for a basic insulated 2×4 wall with a single layer of drywall on each side is STC 35-38. The STC rating for a basic wood structure floor/ceiling is STC 40-43. (3) Published performance data is for single unit only. To determine the specific STC ratings of glass and a 2020 Consumer Perception Study by John Burns Real Estate Consulting LLC. Today, the OITC rating System is used to assess any barrier meant to block out low frequency sound. 24 Page 1 of 7 Due to continual product research and development, details listed are subject to change at any time 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. Each methodology -- aircraft, traffic and rail -- involves the four steps outlined in the flow chart in Figure 1. 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). 03. This rating increases to STC 42-45 with steel studs. 125 x 47. * * [The data and information set forth are based on samples tested and are not guaranteed for all samples or applications. The presence of low-e or argon have negligible effect on sound attenuation characteristics. 28: 0. 228. Fixed Frame Direct Set Window — Dual-Pane Insulating Glass 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. Pella ® Reserve ™ Contemporary - Multi-Slide Doors Supporting documents for this product: Thank you for your inquiry to Andersen® Windows. WHEREAS, the applicant now seeks an amendment to change the Board-approved site plan to (2) The values shown are based on Canada's updated ENERGY STAR® 2020 initiative. It is used to specify the sound transmission loss properties of exterior The definitions of two ratings: Sound Transmission Class or STC and Outdoor-Indoor Transmission Class or OITC; The project’s design requirements and how they impact the glazing system, and; How to calculate an STC or OITC rating; STC versus OITC. Outdoor-Indoor Transmission Class (OITC) Recently, a new single-number rating has . Pella 2020 Architectural Design Manual Division 08 – Openings Windows and Doors www. The higher the OITC rating, the better resistance to sound Rating Outdoor-Indoor Sound Attenuation1 This standard is issued under the fixed designation E1332; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. The final STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. 5 2 01 4 6 Double Vent 12060 48 S2009-553 HS-LC-25 0. 7 percent in 2023—but in line with the average over the past 20 years of 2. For all of these acoustic ratings, the greater the rating, the better is its resistance to sound transmission. com or call us to learn more about our sound rated openings. 6. Thermolite Sound Transmission Loss Test Report Results ER = Canadian Energy Rating (1) Glazing performance values are calculated for Pine using NFRC 100, NFRC 200 and NFRC 500. 250 Series Casement Feb 3, 2025 · In 2025, the cost-of-living adjustment, or COLA, is 2. with grilles-between-the-glass PEL-N-237-01042-00001 0. TLs are measured at somewhat lower frequencies than in STC testing. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. The STC rating for this casement window is 26 and the OITC rating is 22. U-Factor values shown are based on a standard sill and pine interior. * Impact windows with low-E and/or insulating glass as compared to single pane non-coated glass 2. The sum of the deficiencies below the contour curve must not exceed 32. Rating OITC . 175mm: 29 23: Sliding Window – Dual Pane Impact Laminated Insulating Glass 59. other wood species may vary. J2247-13-303-11-R0 Insulation Included 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 places like New York City, it’s all OITC,” he says. Glass size and glazing system will affect STC rating. Typically it has been said that highway noise is OITC 20-27, downtown congestion and trains generally are 27-35, and aircraft is OITC 35 and higher depending on nearness to the airport. Others include the sound transmission class (STC) and the noise reduction coeffi cient (NRC). The figures in Column 3 for theA-weighting adjustments are taken from ANSI S1. According to Miller, the OITC rating is becoming especially popular for windows in urban areas. OITC Rating The Outdoor-Indoor Transmission Class (OITC) is calculated by subtracting the logarithmic 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. Thickness Third Pane . Understanding STC ratings for drywall can be complex. Dec 20, 2024 · (1) See size charts in this section for available sizes. Visit www. 5 mm — 25 22 23" x 59" 11/16" 5 mm 3 mm — 31 26 FIXED – Dual-Pane Glass 47" x 59" 11/16" 3 mm 3 mm — 29 25 47" x 59" 11/16" 5 mm 3 mm — 32 27 VENT – Triple-Pane Glass Transmission Class (OITC) rating of 28, and a Sound Transmission Class (STC) rating of 37. com www. Overall Glazing . STC Rating (STC Calculation) After reading the (TL) of the contour curve at 500HZ, the sum of the deficiencies below the contour curve must not exceed 32. 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. What Is an OITC Outdoor-Indoor Transmission Class (OITC) is a single-number rating system for acoustical performance, developed primarily for the typical exterior noise spectrum. with integral Wincore 7700 Series Thermal Performance Chart STYLE CONFIGURATION GLASS REFO GRIDS U‐Factor R‐Value SHGC VT ENERGY STAR Climate Zone Certification Status Revision Date: 02/01/2020 Page 2 of 11 Pages To determine a single OITC for the wall system, first calculate the OITC using both Equations 1 and 2, using the combined weight of both wythes, then linearly interpolate between the two resulting OITC ratings based on the relative weights of the wythes. G. Sep 14, 2021 · It is one of the most common sound ratings that plays an important role in soundproofing spaces and keeping your project up to code. Rating OITC Rating Glazing Thickness Exterior Glass Thickness Interior Glass Thickness Third Pane Thickness (ML) VENT – Dual-Pane Glass 23" x 59" 11/16" 2. TESTING Windows and doors put to the test. Here’s a look at what you be able to hear at each OITC window May 6, 2020 · Outside-Inside Transmission Class Rating used to classify acoustic performance of glazing in exterior applications. 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. Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. Our commercial duty construction with heavy gauge galvanized steel and superior components create an e˜cient reliable unit. STC STC Rating To obtain the Sound Transmission Class (STC), read the TL of the contour curve at 500 Hz. A good OITC window rating is 30+ and usually comes with thicker glass (½” or more) and added glazing for additional sound reduction. 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. info@greenfiber. OITC Rating The Outdoor-Indoor Transmission Class (OITC) is calculated by subtracting the logarithmic Pella 2024 Architectural Design Manual Division 08 – Openings Windows and Doors www. 175mm: 7. greenfiber. the rating, and Table 3 shows an example worksheet for calculating OITC. The latest editions of the stan- PEL-N-237-01041-00001: 5. Thickness Exterior Glass . MTC was developed to address shortcomings of STC and RW at low frequencies important for Jan 7, 2025 · (1) See size charts in this section for available sizes. 14 - 10logΣ f10((L f - TL f + A f)/10) (dBA Jan 7, 2025 · Pella 2024 Architectural Design Manual Division 08 Openings Windows and Doors www. Th ose ranges, along with the glazing to achieve them, are as follows: I. Both OITC and STC indicate a wall’s ability to block the transmission of sound from one side of the wall to the other. Outdoor-Indoor Transmission . 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. 250: 7/8" 3. Interior Glass . Oct 18, 2023 · 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. Table 4 — Minimum STC ratings required for single or composite wall and floor-ceiling assemblies that separate a core learning space from an adjacent space . RW is similar but covers 100Hz to 3. ] Rating OITC Overall Glazing Rating Thickness Exterior ; Glass Thickness Interior Glass Thickness Sliding Window – Dual-Pane Standard Insulating Glass; 59. It is called the outdoor-indoor transmission class (OITC). 15kHz and is used in Europe. The latest editions of the stan- Jan 23, 2025 · How is OITC different from other ratings? While other sound transmission metrics exist, OITC specifically tests the assembly's resistance to lower-frequency sounds. 4. The OITC (Outside-Inside Transmission Class) rating is used to classify acoustic performance of glazing in exterior applications. Rev. 175mm 3. The formula to calculate OITC from TL test results is: OITC = 100. It uses decibel (db) levels measured between frequencies of 80 Hz and 4,000 Hz, making it a better measure for low sound frequencies such as road noise. A good level of isolation for walls and ceilings is STC 50 plus. 5 percent for military retirees and veterans who receive disability payments from the VA. The same process is used to determine STC ratings for doors. 10 Table B. com LS-AW-3 The document discusses methods for calculating various acoustic ratings including STC, RW, MTC, and OITC. V250-DH-2. As with STC ratings, the higher the OITC number, the more sound resistant the product is. Glazing I. SC: S. Calculated by using the sound transmission loss values in the 80 to 4000 Hz range as measured in accordance with ASTM E-90(09). 2 Test Method The door assemblies shall be tested in accordance with ASTM E 90. OITC: Rw: 1/4″ RAL-TL85-169: 31: 29: 32: 1/2″ Structural Charts. The STC rating for a six inch concrete sub-floor is 52-55. Presentation of Results includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Description. 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. Size and Performance Data • National Fenestration Rating Council® (NFRC) • Texas Department of Insurance • STC (Sound Transmission Class) • OITC (Outdoor-Indoor Transmission Class) See the Glossary of Terms for more details on each of these certifications and testing protocols. The STC rating has been in existence for many years and is based on speech sounds. These ratings are all single numbers used for comparison of various assemblies. (2) Not available for knock down frame. Ratings achieved at that size are representative of all sizes of the same configuration. 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. 250 Series Double-Hung. 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. 1 4. Fixed Frame Direct Set Window — Dual-Pane Insulating Glass Transmission Class (OITC) rating of 28, and a Sound Transmission Class (STC) rating of 37. com ISD-1 Pella ® Reserve ™ Traditional In-Swing Patio Door Product Selection Guide Pella manufacturers stipulate that ratings conform to applicable NFRC procedures for determining whole product performance. 1. com 250-BFD-1 250 Series Premium Bifold Door The information published in this document is believed to be accurate at the time of publication. The STC rating frequencies used in STC ratings correlate in a general way with subjective impressions of sound transmissions for speech, radio, and television. OITC Outdoor-Indoor Transmission Class (or OITC) is a relatively new way of measuring sound transmission, an OITC rating is May 22, 2022 · Thanks, Terry, for the helpful information. UPDATED; TD-138 - Heat Treated Glass for Architectural Outdoor-Indoor Transmission Class (OITC) • The measurement of sound transmission from the external environment into the building envelope • Testing uses ASTM E1332 Standard Classification for the Determination of Outdoor-Indoor Transmission Class • OITC includes a range of frequencies lower than the STC. 800. J2247-13-303-11-R0 Insulation Included STC OITC Test Date Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Tuscany I V400 updated 09. Fax: (910) 452-1848 Professionals use the OITC rating System less frequently than the STC rating System. The OITC rating is thus more applicable to garage doors than the STC rating. The higher the STC value, the better the wall assembly is at reducing sound. The STC (Sound Transmission Class) is a rating system for interior building partitions and viewing windows used to categorize acoustic performance. 08/31/2023 Bookmarks are also included in this PDF document and are available as an additional navigation option. OITC Rating Outdoor Indoor Transmission Class (OITC) calculated by subtracting the logarithmic summation of the TL values OITC rating of at least 31 dBA be installed on the east façade (Second Avenue frontage); that windows with an OITC rating of at least 26 dBA be installed on the south facade (East 20th Street frontage); and that central air - conditioning be provided; and . ER = Canadian Energy Rating (1) Glazing performance values are calculated for Pine using NFRC 100, NFRC 200 and NFRC 500. Pella 2024 Architectural Design Manual Division 08 – Openings Windows and Doors www. Rating. The sound attenuation properties of a glazing type will be achieved with the plastic interlayer Stc rating glass chart acoustic. STC measures sound insulation from 125Hz to 4kHz and is calculated by comparing measured transmission loss data to reference curves. This rating is based on the difference between the overall A-weighted sound level of the sound spectrum given in Table 1 and the overall A-weighted sound level of the spectrum that results from arithmetically subtracting the transmission loss or noise Windows and doors can help block outside noises whether you live in the city or on a farm. If thicker glass material is used, the rating can go up to 35. energystar. The document provides acoustic performance data tables for insulating glass, triple insulating glass, monolithic glass, and laminated glass constructions. 27: 57. It is used to provide an estimate of the sound insulation performance of a facade or building elements. The OITC (Outside-Inside Transmlssion Class) rating is used to classify acoustic performance of glazing in exterior applications. Sound Control Sell Sheet [PDF] SELECT ALL DOWNLOAD SELECTED. 02 3. Key Aspects of OITC: Pella 2024 Architectural Design Manual Division 08 – Openings Windows and Doors www. Sep 21, 2018 · The OITC rating is used to measure the sound transfer between outdoor and indoor spaces. 18. 0024 greenfiber. Download. 1): STC Rating To obtain the Sound Transmission Class (STC), read the TL of the contour curve at 500 Hz. While OITC is often a slightly more appropriate way to evaluate windows, it isn’t nearly as recognized as STC, nor has it Ratings achieved at that size are representative of all sizes of the same configuration. 1 — Minimum STC ratings recommended between an ancillary space and an adjacent laminated and insulated glass products can be used with relatively high STC ratings for indoor applications while also reaching high OITC ratings for exterior applications. Actual results may vary. *OITC is estimated based on this test. Outdoor/Indoor Transmission Class (OITC) and is an integer rating of how effectively an exterior building element attenuates, or reduces, airborne noise from outside to inside a building. 6 percent. 3-08 Rev H 02/16 Superior Sound Control 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 options. ENERGY STAR® values are updated to 2023 (Version 7) criteria. 9375mm 32: 26 Hurricane Shield Series includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. The presence of low-E or argon have negligible effect on sound attenuation characteristics. Save as PDF 800 Park Drive , Owatonna , MN 55060 US | (800) 533-2080 frequencies used in STC ratings correlate in a general way with subjective impressions of sound transmissions for speech, radio, and television. 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. Opening stc_rating_chart. 250 7/8" 3. The attached Sound Test Report covers all BTU/voltage capacities, controls and air patterns. This increase is lower than in recent years—5. OITC is a single number rating which is directly used in building codes. OITC and Soundproofing Windows To start, the higher the OITC rating, the less sound will travel through the window. E413-87 in an acoustical wall. STC Rating To obtain the Sound Transmission Class (STC), read the TL of the contour curve at 500 Hz. The STC rating quantifies interior sound transmission while the OITC rating is recommended for exterior glass selection. After a 1/4” Thermolite sound control window was placed behind the same window, the STC rating improved to 43 and the OITC rating improved to 33. and calculated in accordance with ASTM E1332 (1990). 75 5 0 1 4 12 12 0 6 0 48 GENERIC STC and OITC RATINGS Not to be used for design or specification purposes 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 35 28 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. 5 mm 2. The frequency range used is typical of outdoor traffi c noises. Pella. Explore noise reducing windows and doors from Pella. Sound Transmission Loss (dB) 48. Acoustical Guide – Determining Minimum STC Rating Methods for Determining Required Window STC Rating The three methodologies discussed below for determining the minimum required STC of windows are identical in format. 1/8" overall - 1/8" glass 33 26 30 Outdoor/Indoor Transmission Class (OITC) - The OITC rating is used to measure the sound transfer between outdoor and indoor spaces. Class (or OITC) is a relatively. OITC. The charts include Silver Line® Product Performance Sound Transmission Ratings Silver Line® Product Series Silver Line Product Type IG Glass Type Sound Transmission Class (STC) Outdoor/Indoor Transmission Class (OITC) V3 SERIES SS 27 23 DS 28 22 3mm/4mm 33 26 Laminated DS-DS/060/DS 35 30 SS 27 23 DS 28 22 3mm/4mm 33 26 Laminated DS-DS/060/DS 35 30 SS - - DS 27 The final STC rating of a room is a composite, not an individual component calculation. new way of measuring sound transmission, an OITC rating is [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- Ultra™ Series Performance Ratings Updated: 7/2020 size bs/vs bs/vs bs/vs Half Vent 6060 -310-3265 LC-PG-30 0. N/A The STC rating for a basic insulated 2×4 wall with a single layer of drywall on each side is 35-38. Pella ® Reserve ™ Traditional Hung Window Aug 8, 2022 · 4. (OITC 33) HMF EXPRESS Current STC Offering (All 1 3/4" Thick Doors, up to 4080, and available in 2-3 weeks lead time) STC 42 (OITC 35) STC 46 (OITC 36) STC 46 pr. ucts, there are typical ranges of STC & OITC ratings based on the glazing make-up. 1 mm STC Ratings Chart. 21. In the case of both STC and OITC ratings, a higher the rating, the better as it indicates that less noise is detectable. 9 percent in 2022 and 8. Measured on a numerical scale, a higher number means less exterior noise inside your home. 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. Innovation Credit 1 (Up to 5 points) Innovation Project teams can use any combination of innovation, pilot, and exemplary performance strategies to earn Ratings derived from non-operable assemblies shall only be used for experimental purposes and are not part of this document. Air Space Secondary Window Glazing (Storm Window) STC Rating Range OITC Rating Range 1/8” annealed (DSB) + 1/8” annealed (DSB) 1/2” None 27-28 23-24 of about 20 to a high of 55. 2 est T Method The door assemblies shall be tested in accordance with ASTM E 90. Acoustical Guide – Determining Minimum STC Rating Figure 1. Glass size and glazing system will a ect STC rating. 08/31/2023 Ratings achieved at that size are representative of all sizes of the same configuration. 5” Acoustics Assembly Number: ISS-00 STC: 43 OITC: 28 Report No. interlayer (where applicable). These Feb 11, 2025 · OITC: This is a much newer rating system developed specifically to measure the extent to which an exterior wall insulates against outdoor noises in the low- to midfrequency ranges: heavy traffic, airplanes, trains, etc. For example, if the transmitter played a sound at 60 decibels and the receiver picked up 30 decibels, the STC rating would be 30. (2) The values shown are based on Canada's updated ENERGY STAR® 2020 initiative. between OITC and STC? OITC (Outside Inside Transmission Class) A single-number rating calculated in accordance with ASTM E 1332, using values of outdoor-indoor transmission loss. Oct 14, 2014 · Sound ratings were developed by the American Architectural Manufacturers Association (AAMA) and the American Society for Testing and Materials (ASTM) to standardize the testing and rating of sound transmission for building components, particularly windows. (OITC 37) STC 46 pr. This sound rating increases to STC 42-45 with steel studs. OITC is one rating system available to help compare the acoustic performance of various wall systems. OVER FOUR MILLION UNITS INSTALLED Nov 24, 2022 · Intertek – one of the largest industrial testing companies in the world – tests windows in its facilities for both STC and OITC ratings. Other ratings may be computed using the same worksheet subsituting the appropriate data for the rating instead of the sound transmission loss. The STC and OITC ratings shall be calculated in accordance with ASTM E 413 and E 1332, respectively. . com V-DH-1 Product Selection Guide Size and Performance Data. Other rating systems might measure sound transmission at higher frequencies. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. 0. (4) The higher the level, the greater the product's ability to resist forced entry. Performance with additional options may not be the same as Standard and Special size units. 1 This classification provides a single number rating for transmission loss or noise reduction data that have been measured or calculated. rvf ohj eymhr cmz trme uodtpa jimqusu xma rzd icld ykdr btogob eiinvwxc cviq byvzmyn