These new rules feature in Approved Document F, which provides guidance on adequate ventilation in properties, and will impact both new and existing homes, along with extensions and self. Designed to be a functional part of a window that lets air circulate through your home, according to Building Regulations, trickle vents come highly recommended. VELFAC and Rationel doors are tailor made so they can be designed to meet your tastes and needs thanks to our bespoke service. Trickle Vents are designed to provide fresh air ventilation for improved in-home air quality while the window remains closed and secure. They offer a more durable and reliable solution for house builders and fabricators, with better weathering and acoustic properties, a positive closure, and a more straightforward. A trickle vent is also included. Spent ages reading about it and it seems that they make a huge difference in terms of noise. acoustic result. Impressive thermal and acoustic insulation - U-values as low as 0. £3. Equivalent area: 14,427–34,032 mm²/m. VAT. favorite_border. Air Leakage – 0. RRP from £34. Download. These small trickle ventilators are designed to deliver controllable whole room ventilation. Ironically, the spare bedroom (which faces a railway line) has acoustic vents through the wall rather than trickle vents through the window frames and it is. VAT. Framevent PVCu Ventilator. Special paint finishes available for trickle vents; Based on successful Trimvent® principle; Deflects air up and down; Thermally insulated; Matching screw covers;. If you already have pieces of egg crate pattern acoustic foam lying around, you can use them to plug your air vent. I spoke to a window company about their acoustic glazing range. Trickle Vents; Titon SF Xtra 13 Vent 465 x 23mm - White; Zoom. ago. RW Simons Ltd PVCu Trickle Vents range is called Framevent and is the latest addition to our extensive range of window ventilators. The Simon Framevent HF & HF + tricklevent range have been designed to help comply with. Acoustic trickle vent. Summary 1. Manufactured in the highest quality, U. The primary purpose of trickle ventilation is to remove polluted indoor air from a building and replace it with ’Fresh’outside air. Summary 1. Your Price Apply / Login. Visit our website now. and two 'acoustic' trickle vents: • - 66 dB day - LAeq,8h 61 dB night LAFmax not normally exceeding - 80 dB more than 10x per night . A trickle vent is a device usually fitted at the top of a window that allows fresh air to circulate naturally through a room, and allows polluted air out. posted. Espagnolette with lock. WHITE 400mm Trickle vents from just £3. The acoustic vent is installed into a timber packer, which is fitted and sealed on site and can achieve a sound reduction value of Dn,e,w (C; Ctr) = 40 (-1; -2) dB, and an equivalent free opening of. ventilation (Glidevale acoustic low profile vent *TVALdB450/800) to achieve up to *40/42dB Dn,e,w sound reduction. Acoustic trickle vent. Provides an outstanding Dn,e,w; 42dB (A) for areas with high external noise transmission. Hopefully the first of many more upgrades, and after seeing Thermally Broken suites specified for over 2 years, good to see the requirements finally stick on a…Secondary glazing does not need trickle vents which improves the acoustic performance. The SM ULTIMA is a high quality, ABS acoustic window vent offering 2600mm2 EA airflow and providing a 40 db Dne W sound reduction in the. Our 3. Independently tested by Sound Research Laboratories in accordance with BSEN20140-10:1992, ISO140-10:1991. The aesthetically pleasing and patented design helps to reduce the visibility of the trickle vent on a window. Ventilation helps you to protect the building fabric long-term, save energy and retain the value of your property. (closed to trickle), max 40m 3/hr. VAT. Using Trickle vent to reduce noise. Stocking part F compliant window trickle vents from brands like Glazpart, Greenwood & RW Simon. This product is equally suitable for domestic and non-domestic applications. Download. The question is usually followed by a silence as the customer thinks about what they already have. 4. Glazed-in window vents are activated with a single finger. This can be fiddly so it may be easier to cover the whole inside with acoustic foam before you start adding in the panels. Proposal It has been proposed to redevelop the former Maybloom Club site, Bostall Hill, London, SE2 0RA, toTrickle Vents allow you to have a small aperture in a window for a controlled amount of ventilation. The ‘p’ (projection) dimension of each can vary depending on if it is open or closed. Acoustic trickle vents often involve totally different window frames or bolt on additional sections, I'd be surprised if. Non-electric acoustic though wall vent, provides controlled background ventilation and noise attenuation up to 50dB Dn,e,w. Glidevale ALDB Acoustic Trickle Ventilator 8000mm. Happy trickle vent day! As of today, June 15th 2022, the newly revised Building Regulations for England have come into force. GREENWOOD ACOUSTIC 5000EAW. Browse 10 free BIM objects and Revit families that are ready to use on your projects. Lockable restrictor (160mm or 270mm) Click vent. Note: this will consist of 4 x 300mm section with 2 centre joining pieces. Lockmaster AutoEngage. Nothing stopping you from. Trimvent® Select Xtra S13 is a surface mounted plastic slot ventilator that fits over a 13mm slot in a window and provides an Equivalent Area (EA) of 2000mm2, 4400mm2 or 5000mm2. Satin Brass. In addition to its other benefits, mechanical ventilation with heat recovery (MVHR) systems are sometimes specified by planners when homes are built in noisy locations (flight paths, motorways, etc. Download. We are official stockists of Rytons Vents. Surface mounted noise reducing acoustic trickle vent. redeem. Suffix product code with:-020 (white), -001 (SAA. Recesses over a 16mm slot. -Hardware : Locking espagnolette. Acoustic test data available upon request. MA3051 ACOUSTIC VENTILATOR. Existing homes. The Acoustic Purge Fan is specially treated with acoustic foam to reduce breakout and induct noise, ensuring end-user comfort during operation. Explore our product database and get technical information on VELFAC product ranges - including open features, accessories. Product face sheet. VAT. *much* quieter than the master bed. Explore our product database and get technical information on VELFAC product ranges - including open features, accessories. Acoustic window ventilator top of page. WHITE 400mm Trickle vents from just £3. As one of the market leaders in tile ventilator manufacture in the UK, Glidevale Protect’s range has been collated for over 35 years and includes hundreds of dedicated profiled tile ventilators matching almost. Acoustic lining reduces sound by 38dB with internal grille fully open and 39dB when closed. Developed in 2 sizes the vents performance will be 5000. Internal baffle reduces light and draughts. Availability: Item stocked in our warehouse. In noisier locations, such as near a busy road or an airport, the trickle vent can be designed with additional acoustic options giving even more noise reduction benefits. 497mm (5000EA) 215mm (5000EA) 173. Compare that to our old trickle vent that was 23mm, that’s just over 90% thinner. Yeah, it might be the same mechanism as what they use for mufflers (in which you. Those fitted to the frame are known as slot vents, and those between the glass and frame glazed-in-vent. Acoustic STC –TV250 Vent and Canopy – open 35dB – closed 49dB. com / 01206 713801 Product Product Code (L) Length (W) Width (P) Projection Closed-Open Free Area (mm2) Slot Detail SF Xtra 2500EA Vent only TA5220 425 23 10-24 4207 SF 418 Canopy only TA5005 418 23 27 5114 SF Xtra Sound Attenuator 2500EA Vent 25mm TA5221 464 35 37-51 3470 FREE Same-Day Despatch with Next Working Day Delivery on All Orders Over £95*. Trickle facility to allow air ingress even when closed. Trickle vents quietly create a healthy environment for your home and family. Keep your trickle vents open. Complete with the unique Brookvent double action close position and a high performance thermal foam seal, the SM 1200 ensures the ultimate in comfort control for the end user. This is a type of acoustic soundproofing. For 45 years, Titon says its core product has been the window trickle (or ‘background’) ventilator, claiming to be the biggest manufacturer and supplier of these products in the UK. Trickle ventilators provide ventilation to the room without the need to open the main window, reducing noise levels as a consequence. Acoustic Information (31) User Guides (47) Fault Finding (13) Calculators (1) Test Results (36) URL (8) Manuals and Documentation (Obsolete) (35). RW Simon Ltd have launched a range of acoustic ventilators to assist clients in creating a satisfactory solution for all their acoustic requirements. An alternative is to install acoustic trickle vents. Ventilation can be provided through any appropriate means. Read More. Will help to reduce condensation. Ventilation levels 47% RH - 2500mm ventilation area 65% RH - 3815mm 2 v entil ao r ENERGy SAVER, HUMIdITy SENSITIVEwall. duct sizes. 16 years ago. Ultra Vent and Grille; Energy saver humidity sensitive vent; Acoustic through frame. Our windows include trickle vents to provide ventilation and to comply with the latest. ukdiyboy, Feb 9, 2021 #6. AC2. Acoustic test data available upon request. blackthornjohn • 6 mo. 2500EA. Acoustic performance tests by BRE Acoustics. Product face sheet. There are 3 files available to download including: Brochures and Images. Suitable for bedrooms and other rooms where low noise levels are a priority. Background - usually provided by trickle vents installed within a window frame ; Purge - either natural (by opening a door or window) or mechanical . Suitable For. Across our Rose Collection, we offer expertly designed, beautifully authentic sash horns. Share. Great for both commercial and residential. Product Description. ) and they think standard window-mounted trickle vents would act as noise pathways. A range of eight models from 100 to 315mm dia. So if the ventilator is effectively blocking sound in some way then the vent will let a lot less noise in than the window does when opened just a mm or two. Classification Pr_30_59_94_90. Trickle ventilators (or trickle vents) provide this effective background ventilation for a home, contributing to a healthy living environment by enabling unobtrusive and controllable whole-room ventilation. All Glidevale Trickle Ventilators have been tested to meet the building regulations. RW Simon Slotvent Joiners . Simon Air Management have been manufacturing and supplying ventilation and air management systems to the glazing and construction industries for over 50 years. The benefits and limitations of a basic acoustic vent2. Rytons Acoustic Vents. 79. Donald BSc (Hons) AMIOA T: 0330 043 1764 Page 4 of 24 1. - Aluminium profiles with Plastic endcaps. Internal baffle reduces light and draughts. VAT. Addition of a wet room to an existing building:. • Exceptional attenuation of external noise pollution (up to 56dB), ideal for built up areas effected by traffic, railways and general noise pollution • Sonair F+ ventilates and cleans the air • Independently tested by the BRE • Air cleaning and filtration • Low energy consumptionThe complete acoustic kit (EHT + 125 mm duct + acoustic foam + acoustic canopy) can attain an acoustic attenuation of 52 dB, which places it among the best products available on the market. 47 (-1;-2) dB. Don't want to block it all together. A decentralised Mechanical Extract Ventilation (d-MEV) system is a low energy, continuous mechanical extract ventilation system designed to draw. Many types of vent offer 2500mm² of air space each, so typically smaller windows in small rooms require 1 vent and larger windows (e. uk info@titon. blackthornjohn • 6 mo. We do get asked how to cure damp and mould around windows and the first question we ask is "what ventilation do you have in the room". Product Description. Special colours available on request for all trickle vents; Felted gasket for increased performance; When specified correctly complies with Building Regulations; Technical Information Close . Air Vents. Your cart will contain total 27 points that can be converted into a voucher of £2. Since 1936, Vent-Axia has been manufacturing a large range of efficient ventilation products helping improve indoor air quality in homes & commercial buildings. Controls, Switches & Sensors. The benefits of a higher performing acoustic ventLearn more: ht. *£95 ex. Trickle vents provide ventilation to any room without needing to open the window, which reduces external noise levels. A trickle vent is a device usually fitted at the top of a window that allows fresh air to circulate naturally through a room, and allows polluted air out. Glidevale Fresh 99H Humidity Sensitive Wall Vent – BIM Object. 6300mm². VAT. Trickle Vents are designed to provide fresh air ventilation for improved in-home air quality while the window remains closed and secure. The concept of ‘acoustic ventilation’, and the technology behind all Silenceair® products, focuses on allowing air to freely enter and circulate in our buildings, while keeping noise out. Lockable restrictor (160mm or 270mm) Click vent. DN Vent provides 37dB acoustic attenuation and provides 1400mm2 equivalent area. External canopy grille (Glidevale Ultravent Grille, supplied separately) provides weather and 4mm insect ingress protection. Kitchen and Bathrooms are good locations for the use of trickle vents because of the condensation problems, but. 5. Core drilled – suitable for retrofit installations. As UK stockists, Window Ware are proud to stock a wide range of RW Simon trickle vents, including framevents, acoustic vents, TTF slimline, as well as their ever popular vent-a-matic circular window vent. There is so. The acoustic Trickle Vents can also be powder coated to any standard RAL colour. Our largest vent, the TVALdB800, is capable of sound reduction up to 42dB Dn,e,w. Other finishes available depending on quantity. *Series 5 & 6 Requires controls kit – sold separately. Enquire now, call 01805 623721Trimvent vents all give optimum airflow. Buy As Trade Add to Basket. However all future homes will require continuous mechanical extract to circulate air and even CMEV. View. There are two kinds of ventilation: background and rapid. Trickle Vents are designed to provide fresh air ventilation for improved in-home air quality while the window remains closed and secure. Trickle vents also work in conjunction. English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk Magyar Bahasa Indonesia Türkçe Suomi Latvian Lithuanian česk. Polish brass. If your property is near a busy road, railway or airport, trickle vents can be designed with a high-performance acoustic option to reduce noise. Trickle Vents are designed to provide fresh air ventilation for improved in-home air quality while the window remains closed and secure. The new slim-line. £7. Enquire now, call 01805 623721. Granada can install an acoustic trickle vent which has been specifically designed to aid air circulation whilst preventing noise waves passing through it. ago. Trickle Vents by "Greenwood" we have these vents available in various colours and sizes. Discover how acoustic ventilation can improve indoor air quality and reduce noise pollution with Greenwood, the leading air ventilation system manufacturers in the UK. com titon. MVHR, which does away. The range was developed to meet increased regulation requirements for sound reduction, and the increased noise exposure resulting from the. Renson's window vents are no exception: they excel in their clever design. VAT. Supply Ventilation. We explain what trickle vents are, why you need them, and how to choose products with a. VAT. 29 Inc Vat. Range includes: Standard through frame. Verified 4 months ago . One of the best performing acoustic vents available in the UK. 4 mm in the Classic range. About this product. Trickle vents provide ventilation to any room without needing to open the window, which reduces external noise levels. Dramatically reduce installation time with an this slimline slotvent with an innovative clip-fitTrickle vent with acoustic damping. The vent has one of the highest decibel ratings on the market for a non-acoustic vent. Available Colors: The overall vent length. EAR42W: Fresh air in or out – no noise. 3. Modularity of acoustic sets provides fl exibility for installation and acoustic performance. 9 Feb 2017. RW Simon Ltd has an extensive range of Trickle Vents ranging in all different sizes to help achieve the amount of free area or equivalent area required to naturally ventilate a building in order to conform to building regulations, our range includes both. The 2500EA and the 5000EA equivalent area vents are the smallest acoustic window vents on the market and achieve the best acoustic performance for window ventilators in the UK – up to 45dB (A) It is a simple and adaptable solution for windows in residential dwellings that have external noise issues or planning restrictions. The ventilator has been designed with upward air deflection to eliminate replacement air. 'usually' trickle vents in upvc/alu are 'in frame' as shown below (its the horizontal bar on the top of the frame)Morris Homes Midlands had a specific requirement to deliver acoustic insulation and ventilation at our site in Swadlincote. There is then also the cost issue. 2500EA routing slot size: 192 x 13mm. Remove the vents,stick masking tape over the holes refit vents. The Vent-Axia Acoustic Purge Fan is used to rapidly. Concealed and surface-mounted. Supplied as controllable internal vent, acoustic ducting and external grille. ECOSlide uPVC sash windows come equipped with trickle vents as standard to meet Part F of Building Regulations. mechanical ventilation and passive trickle ventilation. Learn More . The Acoustic Energy Saver Humidity Sensitive (TVES4dB) and the Acoustic Low Profile (TVALdB450 and (TVALdB800) reduce sound travelling through the vent, whilst allowing ventilation into the property. model has been specifically developed for use with rigid. Typically, standard trickle vent covers offer around 30-35dB noise reduction, whereas an acoustically treated trickle vent cover may offer a 40-45dB reduction when installed perfectly. Acoustic trickle vent. Unique tilting T-bar variable opening. stabilised PVCu, it reflects the growing. Non-electric acoustic though wall vent, provides controlled background ventilation and noise attenuation up to 50dB Dn,e,w. Doors, walls and windows. RRP from £34. TTF Slimline Ventilator. Titon Hardware Ltd. Our aluminium vents (look for the reference VAL) have thermal seals to stop draughts when closed. Greenwood Acoustic window ventilator (White ) Quantity. We sell trickle vents at a price of £15 per vent (inc VAT 15%). 8 mm in the Enhanced range. Although it is important for modern homes to be well insulated, properties still require a certain amount of ventilation in order to avoid problems with condensation and damp. In the closed position the slot trickle option provides upward defl ecting, draught free, ventilation up to 2500mm2/m (Open Area) Geometric Modular Sizes Geometric Equivalent Overall Overall Overall Open Area Area Slot Size Vent Length Hood Length 2000mm2 1705mm2 13mm x 160mm 240mm 205mm 3000mm2 2384mm2 13mm x 235mm 315mm. The Freshvent has 2700 mm² equivalent area. Ventilation systems. 5 psf / 600Pa. com / 01206 713801 Product Product Code (L) Length (W) Width (P) Projection Closed-Open Free Area (mm2) Slot Detail SF Xtra 2500EA Vent only TA5220 425 23 10-24 4207 SF 418 Canopy only TA5005 418 23 27 5114 SF Xtra Sound Attenuator 2500EA Vent 25mm TA5221 464 35 37-51 3470Our elegantly crafted trickle vents for casement windows come in a range of sizes, styles and colour options meaning there is something to suit every form of window. FREE DELIVERY on. Aluminum canopy. We do get asked how to cure damp and mould around windows and the first question we ask is "what ventilation do you have in the room". #1. Acoustic window vents Acoustic Energy Saver, Humidity-sensitive 3815mm 2 4000mm 2 39dB Acoustic Low Proile 1777 / 1600mm 2 4400 / 4400mm 2 40-42dB. Installing acoustic vents can help to reduce the noise coming from trickle vents, making it easier for people to relax and enjoy their space. They will. Window Vents & Wall Ventilation. 60. A hardwood subframe can act as a thermal barrier, as aluminium is a great heat conductor, the wooden subframe prevents cold bridging from the fabric of the building onto the aluminium. Across our Rose Collection, we offer expertly designed, beautifully authentic sash horns. Product Range: Ask us about secondary glazing todayVent-Trex is a unique combined overhead extract fan and trickle ventilator for kitchens and bathrooms that fits within the aperture on top of the window frame. 57 Ex. Acoustic trickle vents I am in a new build house (4 years old) and I am looking to improve the soundporoofing to the front of the house. Continuous Mechanical Ventilation (MEV) Extract Ventilation. Simon Limited. Provides an outstanding Dn,e,w;42dB. They told me that as my windows would have trickle vents, the acoustic glazing would not be beneficial for noise reduction. If you still think opening a window is the best way. Excellent acoustic control was a priority, as the site is surrounded by transport routes, including a railway line. Having recently moved into a new build apartment, the noise through the trickle vents in the bedroom window is driving me mad. 08 Inc. Went to a neighbour who had new stuff put in a cpl years with acoustic lamination and it was perfect - virtually completely silent. Acoustic Dn,e,w (+/-) – vent open 32 (0;1), vent closed 43 (0;-1) Finishes. PureAir Room 260. More information [email protected]. The glass thickness. Trickle vents ruin any acoustic performance gains. Additional tips to help cut noise emissions from your MEV or MVHR system Discover how acoustic ventilation can improve indoor air quality and reduce noise pollution with Greenwood, the leading air ventilation system manufacturers in the UK. Features and benefits: Provides 5000mm² equivalent area from a single vent; Available in 2 sizes: This vent 5000EA - 412mm (L) x 25mm (H) x 70mm (D) Internal/86mm (D) ExternalTrickle ventilators. Ventilation and Noise. Colour. The second review [23], dealing with hybrid. The debate around trickle vents today has been as strong as ever, with questions still being asked about compliance, who is liable and help being sought from various industry bodies. €3. Features and benefits: Provides. Up to 40 db Dne W. Humidity control to regulate supply of fresh air effectively throughout the day in response to changing indoor humidity levels. Suitable for bedrooms and other rooms where low. Proposal It has been proposed to redevelop the former Maybloom Club site, Bostall Hill, London, SE2 0RA, toTrickle Vents allow you to have a small aperture in a window for a controlled amount of ventilation. BV, BV - TV. Vent sizes available: V25, V50, V75 and canopy sizes: C25, C50 and C75. posted. hello@brookvent. Many homeowners, architects and double-glazing companies prefer to avoid trickle vents as they can affect a property’s overall aesthetics, energy efficiency and acoustic performance. Adding secondary glazing means sound must travel through another layer of glass and air space between, helping to diminish its energy and improve sound proofing. So if the ventilator is effectively blocking sound in some way then the vent will let a lot less noise in than the window does when opened just a mm or two. They are commonly operated by opening or closing a flap depending on the need for ventilation. Fixing holes in the frame and cover caps. Delivery. Find and specify trickle vents from top manufacturers with NBS Source. Buy Now. Continuous ventilation has many benefits and offers solution to many social housing issues - especially mould and condensation mould and condensation. VAT) Order Quantity. Let us know how you want the parts delivered and we can arrange it! New in this edition are rendered CAD images to give a clear view of our products. Density planning and brownfield development means new dwellings located close to busy roads . Ex. Ex. £395. Features & Benefits. Addition of a wet room to an existing building:. Where high acoustic performance is required trickle vents should be avoided as they will have a detrimental effect. Donald BSc (Hons) AMIOA T: 0330 043 1764 Page 4 of 24 1. Qty BPD Store. Our aluminium vents (look for the reference VAL) have thermal seals to stop draughts when closed. Learn More . Available in 2 sizes: This vent 2500EA - 250mm (L) x 25mm (H) x 70mm (D) Internal/86mm (D) External. As expected, the standard vent was not very successful in keeping out noise. We are Closed 23rd - 26th December & 30th December - 1st January (Open as usual 27th 28th 29th December Back to normal Hours 2nd January 2024). Available in 3 standard sizes and six standard colours, the unit. It’s also controllable. Not Suitable for Use with Gas Appliances. Glidevale ALDB Acoustic Trickle Ventilator 4500mm Add to Basket. Our Products. This is more representative of a design in the UK that relies on trickle vents for a natural ventilation solution. Ironically, the spare bedroom (which faces a railway line) has acoustic vents through the wall rather than trickle vents through the window frames and it is. Keep your trickle vents open. Acoustic FV (Framevent) Supplied with a PVCu internal flap unit and aluminium external canopy. Ducting & Terminals. Insect, rodent and ember screensCover the sides and top and bottom of your air vent with acoustic foam as you go. Energy saving, reduces over ventilating. Glazed-in, or overglass ventilators are custom-made to size and installed during fabrication to fit along the top of the sealed glass unit. Filter and condensation protectionThe main performance concerns of Trickle Vents are the ventilation rate, thermal insulation, acoustic resistance, water tightness, and air permeability. 1. CLOSED. Surface mounted window vents are specifically designed to operate in conjunction with a routered airflow slot through the frame or sash. Acoustic trickle vents: noise-reducing acoustic vents are also available for external windows, facilitating the flow of air in and out of a building, while helping to prevent the ingress of external noise. There are two width variants, one for use over a 13mm slot, the other for a 16mm slot. Aquwall HY are specifically designed to operate in conjunction with a routered airflow slot through the frame or sash. Zehnder ComfoAir Range. Trickle ventilation system. Designed and developed in the UK, Yales SlotVent allows an appropriate amount of air to pass through the window, helping to remove stale air and reduce condensation and mould, as well as enabling people in cities or near busy roads to benefit from ventilation without having to open their windows. Our window vents are subtly integrated into your façade — and their acoustic damping comes as a bonus. W x H x D: 258 x 240 x 8mm. Water sewerage refund: £170. Schüco Ventilation Vents AWS VV are available as opaque side-hung vents with face widths of 300 mm, 250 mm and 170 mm. Noise assessments results will require acoustic dB reduction in noise transfer through openings in the facade of the dwelling from ventilation. Doormaster. RRP from £2. The EA Series achieves the best acoustic performance for window ventilators in the UK – up to 45dB (A). Acoustic Vents; Glazed in Vents. Ventilation can be provided through any appropriate means. 02 Please note the Vent Units or the Canopy Units can be fitted. The acoustic vent is installed into a timber packer, which is fitted and sealed on site and can achieve a sound reduction value of Dn,e,w (C; Ctr) = 40 (-1; -2) dB, and an equivalent free opening of 2868mm². Doing this will help further reduce echo. 16 ex. It is the shortest vent available to provide 5000mm² EA. By buying this product you can collect up to 27 loyalty points . Note: this will consist of 4 x 300mm section with 2 centre joining pieces. The SM 1200 is a high performance surface mounted window vent that achieves a sound reduction of up to 43 db Dnt Rw in the closed position. The room must achieve an internal noise level of 35 dB(A) over the duration of the measurement period.