OPEN. com' and any phone number given is. All Glidevale Trickle Ventilators have been tested to meet the building regulations. Quantity. 70 . Acoustic performance tests by BRE Acoustics. New higher equivalent area confirmed by the BRE. Suffix product code with:-020 (white), -001 (SAA. Available in 2 sizes: This vent 2500EA - 250mm (L) x 25mm (H) x 70mm (D) Internal/86mm (D) External. The SM 1000+ is a trickle vent with all the same great features of the SM 1000 – including slimline design, built-in insect grille and simple installation – but also comes with the added benefit of rod control operation. Use code 250Save / Spend £500+ Get 10% off. Trickle ventilators provide ventilation to the room without the need to open the main window, reducing noise levels as a consequence. Sound reduced by 43 dB with internal grille fully open and 50 dB when closed ( Dn,e,w) (tested by BRE Acoustics) 8,500mm² (85cm²) equivalent area. 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. There are two width variants, one for use over a 13mm slot, the other for a 16mm slot. Retro-fitted core ventilator with external cowl for background room ventilation. • Multiple trickle vents may be required to meet minimum airflow requirements. Two stage acoustic attenuator of the Akustik air intake combined with Higroster controller effectively muffles sounds up to 43 dB while maintaining the nominal air flow of 28,4 m 3 /h. This includes products such as the surface mountable SM Acoustic window vent, which offers an acoustic reduction of up to 40dB while open. 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. Using trickle vents in every room to provide background ventilation is never a bad thing. As I type this. Continuous Ventilation offers an all round low energy, low noise solution for tenants - and it protects the building effectively. Glidevale Protect TVES4dB Acoustic Energy Saver Humidity Sensitive Trickle Vent - Trickle Vent . RRP from £34. The use of W dB would just clarify they are measuring a power instead of an amplitude, which could mean the difference of a factor of 2 in the dB. co. Find out how to easily retrofit a trickle vent to your door with our step by step video to guide you. We specified a mix of double and triple glazing across the build, and also installed both standard VELFAC vents (concealed within the. Aquwall HY acoustic trickle vents are designed to provide ventilation and fresh air through the window frame, while keeping windows shut and your home secure. Background Ventilation is a key product for a healthy living environment. This makes the vent even easier to use. Ventilation in windows and doors must extract excess water vapour, air pollutants and condensation. The new regulations in regards to trickle vents just seems very backwards. You would have to research whether they would be suitable to retrofit to your windows. Dimensions. Available in standard, acoustically attenuated (for noisy install locations) and humidity sensitive (which open in response to high humidity events), the range is designed to meet even the toughest window trickle ventilation requirements. The question is usually followed by a silence as the customer thinks about what they already have. Rytons Super Acoustic Controllable LookRyt AirCore is a simple and efficient answer to background ventilation. Read More. The trickle vent operates automatically. RW Simon Trickle Vents. Designed to improve natural ventilation in the home, trickle vents have often proved unpopular with homeowners because they can spoil a window’s aesthetic appeal. The link vent is our latest and most advanced trickle vent and the instructions are provided for the shorter 2500 (EQA) vents and its big brother the 5000 (EQA). airvent SM 1000+ Trickle Ventilation. Whatever your query, please get in touch. Size: 400mm (L) x 20mm (H) x 22mm (D) Achieves sound reduction of 40dB closed and 33dB open. Acoustic Vents; Glazed in Vents. I spoke to a window company about their acoustic glazing range. the acoustic attenuation also often typically reduces the airflow. Finish (inner and outer). 1. 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. It will also provide far better ventilation, with a constant flow of clean, filtered air, than. Ultra Vent and Grille; Energy saver humidity sensitive vent; Acoustic through frame. View. The EAQ42W is one of the best performing acoustic window ventilators available in the UK. £9. Trimvent® Select Xtra S16. SF Xtra Sound Attenuator (Acoustic) Vent FOR USE ON PVCU, TIMBER OR ALUMINIUM WINDOWS. A trickle vent above a French door is small and narrow in comparison. Colour Name: White. The RW Simon Ltd TTF Slimline window trickle ventilator is a through frame trickle ventilator that is a robust, yet stylish aluminium ventilator. 2) Are they straightforward to retrofit, ie do i just unscrew my existing vent, slide in the new one and screw in to place or is there more to it. V. English - United Kingdom. Installing attic baffles can help reduce energy bills,. co. Doormaster. We are official stockists of Rytons Vents. You can get acoustic trickle vents for windows which apparently stop sound much better than ordinary ones. Flush fit | White ABS Plastic | 300mm long x 20mm wide x 10mm deep (2,700 mm2 free area). Checkout Now. This can cause health issues through humidity, such as dust mites and mould, or even impact on the long-term. You’ll also find clear plastic window ventilators that fit directly into the glass. Excellent acoustic control was a priority, as the site is surrounded by transport routes, including a railway line. Rytons are the leaders in vents for all applications and their acoustic performance is second to none. Titon is pleased to announce the promotion of Carolyn Isom to the Titon Holdings Board as Chief Financial Officer. Trimvent Select S13 / XS13 FOR USE ON VINYL, WOOD, ALUMINUM OR FIBERGLASS WINDOWS. Flush fit | White ABS Plastic | 300mm long x 20mm wide x 10mm deep (2,700 mm2 free area). If you still think opening a window is the best way. Lockable restrictor (160mm or 270mm) Click vent. Comes complete with Freshvent 100 db and Freshvent 100 Thermo db versions. These may be required by building regulations in. 2) Are they straightforward to retrofit, ie do i just unscrew my existing vent, slide in the new one and screw in to place or is there more to it. Dutch - Belgium; French - Belgium; Dutch - Netherlands“ Acoustic” trickle vents are widely. Buy Trickle Vents online - this how-to guide we will be showing you how to replace a Titon Trimvent Select Tr. Acoustic STC – TV425 Vent and Canopy – open 33dB – closed 46dB. [report] [news] Monday 29th January 2018. It can be seen that the noise through the trickle vents dominates the overall levels, and a higher performance of the trickle vent would be required in the 500 Hz and 1 kHz octave bands if lower internal levels are sought. Doing this will help further reduce echo. The new trickle vent regulations 2022 outline a series of criteria that must be met in order to achieve the correct amount of ventilation for a property. Minimize condensation and safeguard your windows and frames from potential damage. Acoustic performance of 33 Db and an EA rating of 4600, the V4000 is great value and available from stock for next day delivery. hello@brookvent. 60. 5mm (2500EA) 215mm (5000EA) 29. Automatic, no user input. Ventsys Trickle Vents – Free Shipping. Resources. 1. Surface mounted noise reducing acoustic trickle vent. 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". Passivent are specialists in delivering natural ventilation and daylight solutions and a leading UK company in the field of sustainable and energy efficient solutions. VAT)*. 4. 5% of substances and particles that are hazardous to health. The acoustic range incorporates all the features of the standard Aircool® plus additional acoustic attenuation features. 57 Ex. It is the shortest vent available to provide 5000mm² EA. Glidevale Energy Saver Humidity Sensitive Trickle Ventilator automatically adjusts it flow rate in response to humidity levels in a room. Quantity: Add to cart. The latest addition to the Simon acoustic range. VAT. If you live near a busy road or an airport, trickle vents can be designed with additional acoustic options to give even more noise reduction benefits. 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 vents are supplied with pre-fitted. The. SCHÜCO BY GSW VENTILATION VENT AWS VV. Here, you can find the fitting instructions for the Glazpart range of trickle vents used to deliver the required provision of back ground ventilation in dwellings. Our 3. The product is specifically designed for “Through Profile” PVC-U applications using a 10 mm routered slot, and is available in two. Trickle Ventilators Titon manufactures and supplies window and door hardware products ranging from background ventilators and window and door handles, to locking systems, hinges and restrictors. Contact Your Account Shipping &. You’ll need to cut a section off the top to allow the air to pass through; 25-30% should be right. 125 months. Enjoy fresh air indoors with window vents. Add to Wishlist. Trimvent XC16 uPVC/Timber Window Vent - Canopy - 312 x 16mm - White. We supply acoustic ventilation from leading. We also offer the acoustic window trickle vent range in a selection of anodised finishes. 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 ventilation can be provided to ensure there is always an adequate level of background ventilation. Place an order within 08h 51m 57s And we will send your order today. VAT) Plastic trickle vents with fingertip vent adjustment. The Acoustic Window Trickle ventilation range offers a noise reduction of up to 41db which can now make it possible to obtain planning permission for new developments near a busy road, train line or an industrial site that would otherwise have been refused. Renson's window vents are no exception: they excel in their clever design. We are Closed 23rd - 26th December & 30th December - 1st January (Open as usual 27th 28th 29th December Back to normal Hours 2nd January 2024). Optional internal acoustic extension. Glidevale Ultravent Trickle Ventilator External Canopy Grille. 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. The latest addition to the Simon Acoustic Range - Please get in contact for more. When used correctly, trickle vents do not contribute excessively to heat loss. Features and benefits. Available in 3 external cowling colours. 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. 14. Titon SF Xtra 13 Vent 465 x 23mm - White. Product face sheet. Another advantage of Titon’s metal trickle vents is that they are designed to fit over the same slot detail (13mm or 16mm slot), making an upgrade a simple swap. 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. Wasn't sure where to post this ! We moved into a new house in June2010, when it started getting colder we closed the trickle vents on all the windows but still have a draught coming through them. 15. As acoustic experts, we do not recommend trickle vents. Features Substantial sound reduction up to 50dB Dn,e,w. Internal baffle reduces light and draughts. All new and replacement windows will need to meet these regulations or will fail the FENSA inspection, and will therefore not be eligible. Welcome to the HandleStore range of trickle vents for the replacement of existing, tired, missing or broken slot vents found on double glazed windows. Add to Wishlist. Acoustic Trickle vents. Ensure a fresh air supply with window vents from Renson. Our aluminium vents (look for the reference VAL) have thermal seals to stop draughts when closed. Glidevale ALDB Acoustic Trickle Ventilator 4500mm - White. Secondary glazing does not need trickle vents which improves the acoustic performance. Attic baffles, also known as rafter vents, are essential for proper attic ventilation and moisture control. The XS13 is a direct replacement for the S13 range, using the same slot measurements but offering a much. Google has come up with various options including, foam around window frame, acoustic glass etc. 55,000mm² equivalent area and space on the window profiles can sometimes be an issue. Glidevale Ultravent Trickle Ventilator External Canopy Grille - White - External canopy grille provides weather protection and 4mm insect ingress protection. 75 (£14. Concealed and surface-mounted. More about us. Unfortunately, there’s no hiding the fact that they can look unsightly. It can be fitted with an XC13 canopy or GS22 grille. Improved Db reduces noise to new levels of performance, especially in the closed position. 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. Extract fans in bathrooms and trickle vents in windows, to a central extract system, mechanical extract with fewer - sound attenuating – vents, or all the way to mechanical ventilation withby Renson Fabrications. 78 (ex. Acoustic trickle vents. R. 37,. UK Manufacturer of home mechanical ventilation systems and hardware for windows and doors, including handles, hinges, trickle vents and extract fans. 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. The glass thickness. Vent-Trex FOR USE ON PVCU, TIMBER OR ALUMINIUM WINDOWS. The ProSound Acoustic Vent system in white is a high performing acoustic background ventilator, providing up to 55dB reduction (Dn,e,w) and suitable for wall thicknesses of 140mm and above. Dramatically reduce installation time with an this slimline slotvent with an innovative clip-fitEnjoy fresh air indoors with window vents. Equivalent area: 14,427–34,032 mm²/m. The products are made from high. Schüco decentralised ventilation systems stand out from. Generally, to gain maximum performance, the size of the acoustic attenuator should be mirrored on the vent and canopy; and. 'usually' trickle vents in upvc/alu are 'in frame' as shown below (its the horizontal bar on the top of the frame)Passivent’s Soundscoop acoustic air transfer unit also combines crossflow ventilation with exceptional acoustic attenuation. If you’re interested in noise reduction glass, consider our Comfort and Comfort Plus ranges from Planitherm. Quantity. + VAT. The acoustic Trickle Vents can also be powder coated to any standard RAL colour. Trickle Vents by "Simon" we have these vents available in various colours and sizes. Aluminum canopy. Unfortunately moisture in the air is common of everyday living and it needs to go somewhere and we need changes of air too. (closed to trickle), max 40m 3/hr. Tel:. uk +44 (0)28 9061 6505SF Xtra Sound Attenuator (Acoustic) Vent FOR USE ON PVCU, TIMBER OR ALUMINIUM WINDOWS. Mantis 3. For use on timber and upvc windows and doors. Surface mounted noise reducing acoustic trickle vent. However, the changes will not apply in relation to building work where a building. Explore our product database and get technical information on VELFAC product ranges - including open features, accessories and more. Meets requirements of building regulations F-2010+ amend 2013. £2. A properly commissioned and installed MVHR system will meet the necessary building regulations relating to ventilation. It features a thermal foam seal, rod control operation and also comes with a 10 year guarantee. Controlled airflow without opening windows can reduce noise, ideal for urban or noisy environments. This can be fiddly so it may be easier to cover the whole inside with acoustic foam before you start adding in the panels. Window ventilation is essential, and is also enforced by the building regulations. Extract fans in bathrooms and trickle vents in windows, to a central extract system, mechanical extract with fewer - sound attenuating – vents, or all the way to mechanical ventilation with The Freshvent has 2700 mm² equivalent area. Inc. comRytons acoustic trickle vents for walls allows the occupant controllable ventilation with the comfort of reduced noise transfer from outside into the room. Windows can be new or already installed, our trickle vents fit with almost all window types. When the vent was removed, leaving just the opening, thereGreenwood Acoustic Vents. Sometimes the best way to achieve the best acoustic performance in new build applications is to upgrade from a traditional ventilation strategy, e. The units are logarithmic, decibels (dB), so a factor of 30 would be 1,000 times below ambient acoustic noise (over some assumed frequency range). With window vents, you can ensure a constant and natural supply of fresh air into your home through dry rooms such as living rooms and bedrooms. Flush fit | White ABS Plastic | 430mm long x 20mm wide x 10mm deep (4,000 mm 2 free area). View. If the windows are modern double glazing with trickle vents, it may be beneficial to replace the vent covers with acoustic trickle vent covers. Internal and external grilles U. Qty Glidevale ALDB Acoustic Trickle Ventilator 8000mm Add to Basket. More information enquiries@titon. Window vents let the heat out. They're easy to install, cost effective, unobtrusive and easily operated by the occupant. 16 years ago. *much* quieter than the master bed. 66 Inc. 79 inc VAT. Manufactured in the highest quality U. Condensation ventilation is available in a variety of sizes for new build and refurbishment and Rytons acoustic background vents for walls have BRE measured equivalent areas and acoustic (Dn. acoustic result. The RW Simon Ltd Framevent HF (hi-flow) achieves 4,191mm2 EA on a length of only 415mm & the HF + (hi-flow +) achieves 5205mm2 EA on a length of 525mm. BV, BV - TV. £11. No projection when closed. Window ventilation is essential, and is also enforced by the building regulations. Sizes: Length - 465mm Width - 23mm. Just because you cover the vent. Our trickle ventilator products are available for delivery as. Habitable rooms and kitchens: 8000mm2 EA. Core drilled – suitable for retrofit installations. 4080mm² measured area 2500mm² Equivalent Area. Smallest acoustic window vents on the market. External canopy grille (Glidevale Ultravent Grille, supplied separately) provides weather and 4mm insect ingress protection. These trickle vents are screwed to the frame and can be operated by simple finger control. Established in 1958, R. Trimvent® Select Xtra S16. The glass thickness. Additionally, they help remove stale air from the property, which is very helpful if there are any odours lingering in your home. In addition, acoustic. Slot Size: 2no x 13-17 x 135mm. We had the double glazing firm come out that fitted the windows for something else so I. 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. There are many variables to consider in acoustic testing, please contact us for specific. Forum Member. The new 2500EA and 5000EA acoustic window ventilators from Greenwood Airvac make ‘sound’ new additions to the Window Ware range. Generally, to gain maximum performance, the size of the acoustic attenuator should be mirrored on the vent and canopy; and. A trickle vent is also included. Reduces sound by 45 dB with internal grille fully open and 50 dB when closed (Dn,e,w). £3. Our sets comprise of an internal canopy and an external hood with an in-built fly screen. One of the major benefits is that it can be installed in the same. White Window Trickle Vents Ventilation UPVC & Timber Windows (#182414592060) ob (361). Window vents let the heat out. The RW Simon Ltd TTF Slimline window trickle ventilator is a through frame trickle ventilator that is a robust, yet stylish aluminium ventilator. Free postage. Trickle Vents are designed to provide fresh air ventilation for improved in-home air quality while the window remains closed and secure. W. Both window and wall vents are a popular. Any cooling of the internal temperature in winter from a trickle vent is marginal. Hybrid versions of these products provide part natural/part mechanical ventilation and operate in three modes – mixing, boost and passive. Ventilation can be provided through any appropriate means. Ventilation in windows and doors must extract excess water vapour, air pollutants and condensation. 1,394 posts. The 13/16” dimensions are always constant; therefore the body length is always 1-5/8” shorter than the overall length. Glidevale Fresh 99 & 99HdB Wall Ventilators Download. With Waves, you get to enjoy all the benefits of demand-driven ventilation, without major renovation works. RW Simon FV Acoustic Vent 400mm 2500EA . We are Closed 23rd - 26th December & 30th December - 1st January (Open as usual 27th 28th 29th December Back to normal Hours 2nd January 2024). This is due to sound reduction levels being measured differently for trickle ventilators when compared to windows. Trickle vents ruin any acoustic performance gains. Size: 400mm (L) x 20mm (H) x 22mm (D) Achieves sound reduction of 40dB closed and 33dB open. Ventilation building regulations are changing in England from 15th June 2022. 73 £ 4. As the name suggests, these are trickle vents with added insulation. VAT. A range of ventilation rates available. Availability: Item stocked in our warehouse. The ‘p’ (projection) dimension of each can vary depending on if it is open or closed. THIS AREA IS CURRENTLY BEING UPDATED – PLEASE FEEL FREE TO DOWNLOAD BROCHURE FOR FULL INFORMATION>. 00. Ventilation systems. Discover more. Schüco Ventilation Vents AWS VV are available as opaque side-hung vents with face widths of 300 mm, 250 mm and 170 mm. 250-368mm L with air brick fitted. The Acoustic Vent range is perfect for installations in areas where there are high levels of noise. Supplied with a removable protective cover. Sunny Sussex. Addition of a wet room to an existing building: 5000mm2 EA. Trickle Vents - Flush Fit (White - 300mm) £ 5. View Product. Passivent’s Acoustic Aircool range is available as both a window or wall ventilator. Inc. The Trickle Vent brings you the Sonovent Acoustic Solution which was developed to meet the two aspects of living comfort: Physical Comfort – fresh and healthy air without draught; Acoustic Comfort – up to 56 dB noise reduction; There are also four types (S/M/L/XL) with four possible air gasps (10,15,20 or 25 mm). Trickle Vents by "Greenwood" we have these vents available in various colours and sizes. FREE DELIVERY on orders over £600 (£500 ex. Titon SF Xtra Flat Fit Vent (surface mounted). 57 Ex. The Acoustic Window Trickle ventilation range offers a noise reduction of up to 41db which can now make it possible to obtain planning permission for new developments near a busy road, train line or an industrial site that would otherwise have been refused. Our windows include trickle vents to provide ventilation and to comply with the latest. Established in 1958, R. £7. wall. Fitting Instructions. RW Simon Slotvent Joiners . 99. 4. Ventilation is there to improve the quality of life inside houses and offices, which is why our vents – either trickle vents, through-frame vents, over-frame vents, or glazed-in vents – are designed to keep outside noise. Colour. D n,e,w (C;Ctr) – Open position. ukClick above on the desired portal to log in or register. Air Brick: Terracotta, buff/sand, white, grey, blue/black, black, brown. News: Titon Appoints New CFO. Keep your trickle vents open. Buy online and collect in store in as little as 1 minute. The Greenwood Acoustic vents provides the perfect solution, delivering an effective level of air replacement while keeping out unwanted noise. Find and specify trickle vents from top manufacturers with NBS Source. Most types of vent are available in a choice of colours to best suit the window frame and be as unobtrusive as possible. Ordering. Order Before 9pm. Ideal for both timber and PVCu, the Framevent has been specifically developed for the volume market. Multi-Point Door Locks. Really bummed out about this. Contact our team today. Used as soundproof trickle vents, our products help reduce mould. Surface mounted window vents are specifically designed to operate in conjunction with a routered airflow slot through the frame or sash. Performance for the various elements is as follows; Table 2 - Facade element example performance Element Octave Band Frequency (Hz) Noise Level 125 250 500 1000 2000 4000 (dBA) Trickle Vent 373635 34. Your Price Apply / Login. Acoustic performance tests by BRE Acoustics. Stocking part F compliant window trickle vents from brands like Glazpart, Greenwood & RW Simon. 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. Our window vents are subtly integrated into your façade — and their acoustic damping comes as a bonus. Special colours available on request for all trickle vents; Felted gasket for increased performance; When specified correctly complies with Building Regulations; Technical Information Close . With replacement windows the general rule of thumb is to replace like for like. RW Simon FV Acoustic Vent 400mm. Tools, Fixings & Consumables. Call us on 01536 511874 (8:30am-5pm weekdays) or email admin@rytons. Attenuated natural ventilation options. Location. I discuss sound mazes in more detail in the article linked above, but watch this video for steps on how to build a sound maze. Free postage. VAT - Mainland UK Only (NB: Orders placed after 3pm Fri will be dispatched the. The offer includes the following colour versions: white, anthracite, grey, chestnut and oak. 894 The Crescent, Colchester CO4 9YQ United Kingdom. Burglar-proof performance is desired in some cases. These are areas such as kitchens, bathrooms, utility rooms etc, where appliances, showers and baths produce large amounts of moist, damp air which needs to be expelled from the room. Ones which are. 5000mm² Equivalent Area Performance from the smallest vent at 410mm long High levels of background ventilation are required when applying System 1 of the Building Regulations in new dwellings; Intermittent Extract Ventilation and Background vents e. CALL FREE: 01707 830 732; Today's opening times: 8am - 6pm. Surface mounted slot. 5 2 ratings. Thanks to the use of sound-absorbing foam, they dampen external noise much more effectively than standard hoods. Please make any allowances for fittings beads, gaskets etc, or for manufacturing tolerances. Can be installed in internal wall constructions of between 100mm and 150mm. Trickle Vents - Flush Fit (Brown - 300mm) £ 5. These pared-down pieces of kit (measuring between 412mm and 250mm) are the smallest acoustic window vents on the market, yet they offer unbeatable noise-reduction (up to 45dB) and impressive. ACOUSTIDRAIN. I’m looking into buying new window trickle vents or blocking them up completely due to. The room must achieve an internal noise level of 35 dB(A) over the duration of the measurement period. Acoustic Performance Dn,e,w to 42 dB (A) Colour - White. Internal baffle reduces light and draughts.