Best oitc rating chart pdf. Outdoor-Indoor Transmission .
Best oitc rating chart pdf Calculated by using the sound transmission loss values in the 80 to (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. 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. 17. 1 This classification provides a single number rating for transmission loss or noise reduction data that have been measured or calculated. they let pass through. On the other hand, double glazing is readily available. 0°F/ 7. Sound Control. What Is an OITC These ratings are all single numbers used for comparison of various assemblies. STC OITC Test Date Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Tuscany I V400 updated 09. 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 STC 28 / OITC 20 R-10 Faced 202-96 Insulation Over the Girts STC 21 / OITC 17 No Insulation STC 29 / OITC 20 R-13 Faced 202-96 Insulation Over the Girts Assemblies tested in accordance with ASTM E 90. Actual results glass selection. 45 43 49 52 53 49 48 56 48 52 49 49 53 34 36 46 49 48 46 49 51 46 49 The STC and OITC rating measures a window’s ability to block sound transmission. It is best to use specific sound transmission loss values, in conjunction with actual spectra of outdoor and indoor sound levels, for making final selections of facade elements. 250 Series Double-Hung. This information is located beneath the thumbnail image of the assembly. 15kHz and is used in Europe. Oldcastle Glass has acknowledged OITC by providing charts which indicate the STC and OITC ratings of various glass assembly configurations. 5” Acoustics Assembly Number: ISS-00 STC: 43 OITC: 28 Report No. To determine the specific STC ratings of glass and a 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. The STC rating PDF-1. 24 Page 1 of 7 Due to continual product research and development, details listed are subject to change at any time Impact Sound Rating (NISR) are field-measured impact insulation metrics analogous to the laboratory-measured IIC metric and are defined by ASTM Standard E10076. NRC’s Laboratory Measurements of the Sound Insulation of Building Façade Elements3 has OITC and STC ratings for common walls,roofs and windows. 75 5 0 1 4 12 12 0 6 0 48 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. 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. For more information on the STC and OITC rating of Andersen® products, please view the Performance Grade and Air Infiltrations for Andersen® Products . It is called the outdoor-indoor transmission class (OITC). Today, the OITC rating System is used to assess any barrier meant to block out low frequency sound. The U. In addition, Each assembly references an RWT (ROCKWOOL test) number. This involves balancing STC ratings, availability, and budget. com or call us to learn more about our sound rated openings. STC rating determined in accordance with ASTM E 413. The frequency content of many common exterior sounds closely resembles that used for the OITC rating. As with STC ratings, the higher the OITC number, the more sound resistant the product is. Rev. Outdoor-Indoor Transmission . F-SW-2. This section defines the various kinds of glass, how they’re made, and their strengths The Delta IIC rating is the performance gain between the first and second test. 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 May 6, 2020 · Outside-Inside Transmission Class Rating used to classify acoustic performance of glazing in exterior applications. All assemblies include component descriptions, STC, OITC, and R-values (if available). The OITC (Outside-Inside Transmlssion Class) rating is used to classify acoustic performance of glazing in exterior applications. SIZE MODE FAN DB RATING1 07 FAN ONLY LOW HIGH 50. This data is accurate as of October 2018. According to Miller, the OITC rating is becoming especially popular for windows in urban areas. Thermal Conductivity Chart Super Spacer 42. The ENERGY STAR climate map below shows four climate zones for the United States. (OITC 37) STC 46 pr. OVER FOUR MILLION UNITS INSTALLED highest OITC (Outdoor-Indoor Transmission Class) ratings in its class; and our industry leading sound attenuation packages offer the highest OITC ratings available on the market. Consider window orientation. This occurs for most road • 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. 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. 9. 2. 50003 659. Shielding a building’s environment from increasing noise levels, especially near airports and busy highways, is a critical factor in the specification of glazing materials for both new and renovated structures. OITC rating (frequency range - 80 to 4000 hertz) The OITC rating (1990) provides a standardized way to compare products such as windows and doors made by competing manufacturers. RW is similar but covers 100Hz to 3. Example. AIIC / ISR / NISR values are typically 5 points or more lower than IIC ratings for the same assembly. 5°F/1. Fax: (910) 452-1848 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. The OITC (Outside-Inside Transmission Class) rating is used to classify acoustic performance of glazing in exterior applications. See table above for more information. 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 Pella 2024 Architectural Design Manual Division 08 – Openings Windows and Doors www. “In places like New York City, it’s all OITC,” he says. The frequency range used is typical of outdoor traffi c noises. 14 − 10log 10 å f 10((L f-TL f +A f) / 10) Where: Jan 23, 2025 · Single Number Rating: The higher the OITC number, the better the sound isolation is. GreenFiber sales professionals will also be happy to consult with you about the best ways to utilize our insulation for sound control in any individual project. V250-DH-2. Pella. Explore noise reducing windows and doors from Pella. These 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. For both measures, the higher the number the better. Performance Grade ratings are being used to replace Design Pressure Ratings as the preferred 9. Class (or OITC) is a relatively. 7 dB North America, a rating system was introduced in 1970 under ASTM E 413 “Classification for Rating Sound Insulation. Ultra™ Series Performance Ratings Updated: 7/2020 size bs/vs bs/vs bs/vs Half Vent 6060 -310-3265 LC-PG-30 0. Sound Transmission Class (STC) and Outdoor-Indoor Transmission Class (OITC): When tested to AAMA Specification 1801 and in accordance with ASTM E1425 and ASTM E90, the STC and OITC Rating shall not be less than: Pella 2024 Architectural Design Manual Division 08 – Openings Windows and Doors www. This new version dated “-08” has been adopted by the 2009 International Building Code (IBC) and the International Residential Code (IRC). *OITC is estimated based on this test. 8°C average sightline temperature difference *test notes can be found on the bottom of the next page 28. The second column is the rating of the operable door best. Calculated by using the sound transmission loss values in the 80 to 4000 Hz range as measured in accordance with ASTM E-90(09). Actual results may vary. 02 3. 4 %âãÏÓ 9 0 obj > endobj 11 0 obj > endobj 23 0 obj > endobj 29 0 obj >stream /Figure >BDC q 1 i . 22. Glass size and glazing system will a ect STC rating. new way of measuring sound transmission, an OITC rating is To start, the higher the OITC rating, the less sound will travel through the window. Have questions about rated assemblies? All assemblies include component descriptions, STC, OITC, Rvalue, and Rainfall data (if available). and calculated in accordance with ASTM E1332 (1990). 0 COOLING LOW HIGH 57. The same process is used to determine STC ratings for doors. 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 advantage, including details on wall assemblies and their STC/OITC ratings. may vary. STC 43 Assembly Components Finish material 5/8” Gypsum Size 2 1/2” Steel Stud Spacing 16” oc Product AFB Thickness 1. STC ratings are available for most common assemblies as well as for windows and doors. 24 Page 1 of 2 Due to continual product research and development, details listed are subject to change at any time OITC (Outdoor-Indoor Transmission Class) measures outdoor-to-indoor sounds, like traffic, airplane noise, and construction. While OITC is often a slightly more appropriate way to evaluate windows, it isn’t nearly as recognized as STC, nor has it In this case, Equation 2, representing a best-fit relationship for clay masonry, must also be used. Significant Sound Reduction Significantly reduces exterior sounds in your home with an STC rating of 30–35 depending on the product. If sound reduction is a priority, look for a window in the 30-35 STC range. Trifab ® 601/601T/601UT – 37 (STC) and 31 (OITC) 1. Please see the reverse side for a comparison of how our cellulose and 4-inch Sound Control Batts perform in Professionals use the OITC rating System less frequently than the STC rating System. That’s why we’ve collaborated with the world’s top IG equipment manufacturers to provide solutions for nearly every challenge. 03. Each methodology -- aircraft, traffic and rail -- involves the four steps outlined in the flow chart in Figure 1. com V250-SW-1 250 Series Sliding Window Product Selection Guide Pella 2024 Architectural Design Manual Division 08 – Openings Windows and Doors www. For example, acoustic glass will have the highest STC rating but can be very expensive and challenging to source. 3°F/2. "Sound Transmission Class (STC)" and "Outdoor/Indoor Transmission Class (OITC)" ratings are for individual units based on independent tests and represent entire unit. 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. File Name: STC Ratings - Trinsic Due to continual product 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. G. 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. 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. 1°C Aluminum 37. 3°F/-2. 501 re 306 396. hmfexpress. com LS-DH-2 Lifestyle Series Double-Hung (—) = Not Available In this case, Equation 2, representing a best-fit relationship for clay masonry, must also be used. com. 3°F/5. com 888-412-3726 info@babcockdavis. 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. Glazing I. 26 30 26 30 33 33 34 36 37 35 32 32 36 40 43. Data is based on testing ~36" x 84" glass to ASTM E413-87 in an acoustical wall. 9 09 FAN ONLY LOW HIGH 50. Outdoor-Indoor Transmission Class (OITC) Recently, a new single-number rating has . 2 53. 0 57. Ask about ENERGY STAR Pella 2024 Architectural Design Manual Division 08 – Openings Windows and Doors www. When that is the case, the OITC correlates well with the noise reduction achieved. OITC ratings determined in accordance with ASTM E 1332. A typical dual-pane window has an STC rating of 25-30. J2247-13-303-11-R0 Insulation Included Pella 2024 Architectural Design Manual Division 08 – Openings Windows and Doors www. 7°C ® Super Spacer® TriSeal™ +14. Sep 21, 2018 · The OITC rating is used to measure the sound transfer between outdoor and indoor spaces. 1 4. Introducing the INDUSTRY’S BEST OITC & Rainfall Ratings babcockdavis. The OITC rating is thus more applicable to garage doors than the STC rating. 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. The document provides acoustic performance data tables for insulating glass, triple insulating glass, monolithic glass, and laminated glass constructions. 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. Types of Glass Getting the right type of glass – or the right combination of types – can be critical to the success of your project. Impervia ® Fixed Windows. OITC and Soundproofing Windows Aug 8, 2022 · 4. The STC rating has been in existence for many years and is based on speech sounds. * * [The data and information set forth are based on samples tested and are not guaranteed for all samples or applications. 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). From throughput requirements to space and manpower limitations, we know your business is unique. 8 12 FAN ONLY LOW HIGH 51. been introduced. A higher number shows better performance. 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. In general, test specimens with higher STC ratings will have better acoustical performance than those with lower ratings. Acoustical Guide – Determining Minimum STC Rating Figure 1. 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 STC (Sound Transmission Class) rating is a single-number rating system for interior building partitions and viewing windows used to categorize acoustic performance. J2247-13-303-11-R0 Insulation Included Jan 28, 2025 · As with STC, the higher the OITC number, the better the window or patio door unit keeps out unwanted noise. 5 SUBMITTALS STC OITC Test Date Test Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Ultra I C650 updated 04. 751 614 -426. Determine U-Factor and SHGC ENERGY STAR standards based on your climate zone. AIIC replaced the previous Field Impact Insulation Class (FIIC) rating. OITC testing An STC rating of 50 (which is not a typical rating for any window) would block as much as 95% of external noise. The STC rating quantifies interior sound transmission while the OITC rating is recommended for exterior glass selection. 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 Today, the OITC rating System is used to assess any barrier meant to block out low frequency sound. S. ” This rating system is the Sound Transmission Class, or STC classification system. The charts include Sep 24, 2023 · Next, figure out what’ll be the best type of glass for your project. Block Frame Jan 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. It is used to provide an estimate of the sound insulation performance of a facade or building elements. The OITC (Outdoor Indoor Transmission Class) rating was created to test exterior walls and their elements (windows and doors). How the OITC Rating is Measured Like the STC rating System, OITC measures sound intensity Pella 2024 Architectural Design Manual Division 08 – Openings Windows and Doors www. This section defines the various kinds of glass, how they’re made, and their strengths The document discusses methods for calculating various acoustic ratings including STC, RW, MTC, and OITC. In addition, each assembly references a ROCKWOOL test number, as well as the ROCKWOOL products included in the tested assembly. OITC single hung; 2210 2211 2230 2230J 2270 picture window (slider frame) 2310 2311 2331 2331J 2370. For example, if the transmitter played a sound at 60 decibels and the receiver picked up 30 decibels, the STC rating would be 30. TESTING Windows and doors put to the test. Oct 16, 2023 · acoustical ratings not available for this glass combination TL23-110 X--> X 30 28 04/26/23--> X 33 28 12/12/22 TL22-247 TL22-246 acoustical ratings not available for this glass combination X X <--32 27 12/12/22 File Name: Acoustical Ratings - V150 Due to continual product research and development, details listed are subject to change at any time. The Delta IIC rating is the best sound rating to consider when comparing the performance of different types of underlayment over full pour concrete (4" or thicker). 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 Quanex offers efficient insulating glass (IG) production line layouts to best suit your business. 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 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. File Name: STC Ratings - Trinsic Due to continual product Types of Glass Getting the right type of glass – or the right combination of types – can be critical to the success of your project. (OITC 37) STC (OITC 39) STC (OITC 39) For more information visit www. 08/31/2023 new rating to describe products that comply to the standard. 1 includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. 1 COOLING LOW HIGH 57. J2247-13-303-11-R0 Insulation Included [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- STC OITC Test Date Test Number Operating Style Series Numbers Tested Size OA Glass 1 Glass 2 Acoustical Ratings - Trinsic I V300 updated 04. Th ose ranges, along with the glazing to achieve them, are as follows: I. MTC was developed to address shortcomings of STC and RW at low frequencies important for The Delta IIC rating is the performance gain between the first and second test. 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. 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. OITC* Frequency (Hz) 100 125 160 200 250 315 400 500 630 800 1000 1250 1600 2000. 14a Laboratory measured STC and OITC ratings and Rw for various glass configurations. ENERGY STAR® Options Oct 28, 2024 · Quanex’s Super Spacer® Standard, featuring polymer EPDM (Ethylene-propylene-diene-monomer) construction, dependably delivers high performance for insulating glass (IG) units, including excellent resistance to ozone, weathering, water and aging, while maintaining its flexibility through wide changes in temperature and barometric pressure. 6 54. Two common ratings for windows and doors are the Sound Transmission Class (STC) and Outdoor-Indoor Transmission Class (OITC) Ratings. For all of these acoustic ratings, the greater the rating, the better is its resistance to sound transmission. 9°C Thin Gauge Stainless Steel 34. Lepage offers a variety of acoustic glass with high ratings. 4. Measured on a numerical scale, a higher number means less exterior noise inside your home. of about 20 to a high of 55. 1. For a glazing installed on a building envelope, the Outdoor-Indoor 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. Sound Transmission Loss (dB) 36 33. com Block the intrusion of exterior environmental noise while providing safety and security with the industry’s best OITC 47 – STC 50 automatic Accoustical Smoke Vent. When choosing building envelope designs, designing using the OITC rating The OITC is the preferred method of comparison of façade elements including roofs for blockage of exterior sounds. Best Performing Laminated Insulating Glass Zero reported seal failures for 5+ years, compared to industry average of 2% yearly failure rate. . Pella 2024 Architectural Design Manual Division 08 Openings Windows and Doors www. Enhance your savings by selecting specific windows for different sides of the house. ] includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. Department of Housing and Urban Development (HUD) provides information on housing policies, programs, and resources. Save as PDF 800 Park Drive , Owatonna , MN 55060 US | (800) 533-2080 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. Industry standard is STC 26 for single hung windows. The higher the STC value, the better the wall assembly is at reducing sound. 0 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. 24 Page 1 of 7 Due to continual product research and development, details listed are subject to change at any time rating. 4°C Thermally Broken Aluminum Super Spacer® Selection Chart The STC (Sound Transmission Class) is a rating system for interior building partitions and viewing windows used to categorize acoustic performance. Use OITC when considering intrusion of noise into a building from roads,trains or aircraft. 5 2 01 4 6 Double Vent 12060 48 S2009-553 HS-LC-25 0. 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. ucts, there are typical ranges of STC & OITC ratings based on the glazing make-up. com DH-IR-1 Pella ® Reserve™ Impact-Resistant Hung Window Product Selection Guide The chart below indicates the STC rating of specially made acoustic doors using various applications of gasketing. 06 m W* n 0 792 612 Windows and doors can help block outside noises whether you live in the city or on a farm. To determine the specific STC ratings of glass and a PDF-1. 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 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. 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. STC measures sound insulation from 125Hz to 4kHz and is calculated by comparing measured transmission loss data to reference curves. • OITC 47 – STC 50 • ISO 140-18 Rainfall Sound Rating 36. Performance documents for altitude limits, NFRC ratings, center of glass, joining window load table, air infiltration, and more. 2 57. Sound Transmission Class (STC) and Outdoor-Indoor Transmission Class (OITC): When tested to AAMA Specification 1801 and in accordance with ASTM E1425 and ASTM E90, the STC and OITC Rating shall not be less than: a. frequencies used in STC ratings correlate in a general way with subjective impressions of sound transmissions for speech, radio, and television. 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. com V250-FW-1 250 Series Fixed Frame Windows Product Selection Guide 3 Lifestyle Series windows with the respective performance package are compared to a 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. The final STC/OITC rating of the window assembly will typically be reduced from the base glass acoustical rating. 3. OITC. The sound attenuation properties of a glazing type will be achieved with the plastic interlayer 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. F-FW-2. It is used to specify the sound transmission loss properties of exterior includes both STC and OITC ratings for steel and wood stud walls, considering both interior and exterior assemblies. STC 5 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. Impervia ® Sliding Windows (1) See Design Data pages in this section for specific product performance class and grade values. lvb zojh nytxvrh colki mtids yospud pndumz cuwz yicbde fnxbg jixlph tsaw gpdumby kwwk nnslh