Stc And Oitc Ratings, STC (Sound Transmission Class) measures indoor airborne noise like speech and TV. OITC and STC measure different frequencies. Calculation method not approved yet by National Fenestration Rating Council (NFRC) for VIG units. A practical choice for private bedrooms, offices and shared living spaces where additional noise reduction is desired. View the latest STC and OITC ratings. Sep 17, 2025 · STC rates how well glass or windows block airborne noise (measured in decibels). The final STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. Available with several frame profiles, the SL38 terrace door also offers a “zero threshold” option. The STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. Apr 5, 2026 · STC and OITC are two of the most commonly misunderstood sound ratings in architectural specs. Fire rated floor doors maintain the fire rating of a 2-hour floor/ceiling assembly where access is required between building floors. Learn which rating applies to your project and how to choose soundproofing products accordingly. The 5-foot x 5-foot acoustical smoke vents feature industry-high ratings of STC-50, OITC- 46, and ISO 140-18. SOUND CONTROL PERFORMANCE: Solid core interior door engineered with STC 28 and OITC 26 ratings to help reduce sound transfer between rooms. Specific product configurations, including substrates and low-e coatings, may affect the performance of constructed glazing systems. Higher STC = quieter indoors, essential near roads or shared walls. Feb 3, 2026 · Acoustic ratings are STC of 38 and OITC of 34. . STC ratings focus on blocking indoor noise, such as voices and music, while OITC ratings are specifically designed to measure exterior noise from sources like traffic, airplanes, and construction. The enclosed STC and OITC data is for insulating glass constructions only. The ASTM E90 standard is used for measuring both, and the same types of products are rated using the same numerical rating scale. See a full list of Pella's product disclosures. Apr 7, 2026 · Sound Transmission Class (STC) ratings and OITC ratings both rate the effectiveness of an assembly to attenuate airborne sound. For windows, STC ratings range from 18 to 38. 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. Performance documents for altitude limits, NFRC ratings, center of glass, joining window load table, air infiltration, and more. Mar 21, 2026 · STC ratings dominate the soundproofing industry but ignore low-frequency noise like traffic and bass. OSHA compliant Fall Protection Grating Systems allow workers to safely inspect pumps and monitor underground areas. Its original intent was to quantify interior building partitions not exterior wall components. OITC (Outdoor-Indoor Transmission Class) measures exterior environmental noise like traffic, rail, and aircraft. Of particular significance for theaters, the OITC rating effectively prevents low-frequency sounds such as vehicular traffic and airplane noise, while the STC ratings guard against voices and other sources of interior noise. STC ratings are an established way to average how much sound is stopped by something. INTUS Windows announces updated ASTM E90 acoustic test results for the Supera Fixed, Inswing Casement, and Outswing Door with 10/14/4 glass configuration. The new Crystal OPUS ML8 aluminum windows and doors have a 3-7∕16-inch jamb. Learn how OITC ratings fill the gap and which number actually matters for your project. Nov 25, 2022 · To determine how much sound is transmitted through a window, manufacturers conduct testing to calculate ratings for two primary ratings: Sound Transmission Class (STC) and Outdoor/Indoor Transmission Class (OITC). *STC/OITC Tolerance +/-2 STC Ratings What is an STC Rating? STC stands for Sound Transmission Class. This flagship quality model line offers great thermal and acoustic performance, as well as countless design options. STC stands for Sound Transmission Class, a rating system that tells you how well a material—like glass or a full window unit—reduces airborne noise. Apr 14, 2025 · STC and OITC ratings are measures of how effectively a building material or structure blocks sound. STC ratings are used for windows, doors, walls and most building materials. Above data is for reference only. 5 days ago · When you see a rating standard call for a “1/3-octave plot from 125 Hz to 4,000 Hz,” that is 16 bands of test data — the resolution standards like STC and OITC need to distinguish a quiet wall from a noisy one.
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