Sonair Units, Hassocks, West Sussex. Very Good. The Titon Trimvent TV4000 Flat Grille face fixes over the external side of a 13mm vent slot, suitable for use with a TV4000 trickle vent only Aluminium Construction Flat Grille Suitable for use with TV4000 Trickle Vent 380mm x 22mm Available in White or Brown Please Note: Fixings are not included. Tool Storage and Holders. The TV SM is available in made to measure sizes or in bar length in a variety of colors. Product Code: 12605. Titon Trimvent Select XR16 Vent, 351 x 22mm, plastic - For use on Timber PVCu or aluminium windows - Airflow 4000mm2. Titon offers a range. Discreet low-profile vent that fits all timber sash & casement windows. uk info@titon. Surface mounted, ideal for refurbishment. comMetal Trickle Vents: Offer the Premium Vent Choice: The benefits of metal trickle vents are clear - they offer a more durable and reliable solution with better weathering and acoustic properties. 85 +VAT. Titon - Trickle Vent Select XR16 - Brown. Continuous Mechanical Ventilation (MEV) Extract Ventilation. Titon Trimvent Select S13 265mm Surfaced Mounted Slot Vent Brown Part No: 2974. 9 Item(s) Sort By. com titon. 22 each £4. 93 inc. Starting at: £5. MVHR Filters. £3. Two Titon HRV10 Q Plus units with Trimbox NO 2 Filters® have been installed as part of unique self-build project in East Dulwich, London. The Trimvent 90 range of trickle ventilators and canopies from Titon have been specified and fitted on millions of windows throughout the UK and mainland Europe over the last 35 years, so you can trust these vents and canopies will perform and provide optimum airflow to your home. 0800 970 4190. Add to Cart. We recommend use of silicone sealant along the canopy sealant groove and when necessary on the underside of the ventilator. A high performance gasket combined with. Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. I have found a few online, Greenwood, Titon, Simon etc but the more I read the more confused I am getting. ukAAC125HPCWL. sales@titon. VAT £5. com. 35 MVHR units. delivery date Est. Snap on quick fit end caps. titoninc@titon. Mechanical Ventilation with heat recovery (MVHR). Trade Account apply now to get. UK Manufacturer of home ventilation systems and residential hardware for windows and doors, including handles, hinges, trickle vents and extract fans. 93 inc. 2500mm2 EA and 5000mm2 EA versions available. IN STOCK! Our popular Trimvent® Select Xtra trickle vent ranges are available NOW and SF Xtra on short lead times. Titon trickle vents are one of our most popular and reliable vents; each set comes complete with inside and outside canopy, screws and matching cover caps. 894 The Crescent, Colchester CO4 9YQ United Kingdom. Hit & Miss: 271mm L x 95mm H. Size. Titon Trickle Vent Trimvent S13 2700EA Titon trickle vents are one of our most popular and reliable vents; each set comes complete with inside and outside canopy, screws and matching cover caps. Also, the frame vents provide a constant air flow through the window, helping to reduce the temperature on hot days without compromising on security. £736. Screws are usually hidden underneath a cap which will need prising away. com 133 High Flow Terminal Resistance - 204x60x100/400 TA360 - Titon FireSafe ® Air Brick 204x60x100/ TA361 - Titon FireSafe ® Air Brick 204x60x100 Bezelled TA360 - Titon FireSafe ® Air Brick 204x60x100/ TA361 - Titon FireSafe ® Air Brick 204x60x100 BezelledThe vents have an effective free area, in terms of how much air flows through, of around 4000 sq mm. 80 Each Titon Trimvent Select S13 265mm Surfaced Mounted Slot Vent. Add to Cart. Titon Trimvent Select S13 Trickle Vent - Brown. enquiries@titon. The Titon Trimvent Hi Lift is an aluminium slot ventilator that fits over a 13mm slot in a window and provides an Equivalent Area (EA) of up to 4000mm² when fitted with the Hi Flow canopy. A surface mounted aluminium slot ventilator, the Titon SF Xtra Flat Fit Vent is ideal for new-builds or to be retro-fitted. Resources. co. 88 (1 new offer) Brookvent Airvent SM 1000 | Surface Mounted Aluminium Trickle Window Vent Set | Vent and Hood | 460mmx450mm (White) 5. This product is equally suitable for domestic and non-domestic applications. Trickle Vents. Acoustic lining reduces sound by 45 dB with internal panel fully open and 50 dB when closed (Dn,e,w). 0800 970 4190. Manufactured by Titon whose ventilators have been specified and fitted on millions of windows throughout the UK and Europe over the past 20 years, you can trust that these vents and canopies will perform and provide optimum airflow to your. Trickle ventilation system. Product Details. The Hi Lift design improves the Trimvent range to offer increased. A semi-recessed aluminium slot ventilator, the Titon TV90 High Lift Vent provides minimal visual intrusion, and is ideal for new-builds or to be retro-fitted. Buy As Trade. For use over 1/2″ slot. Trimvent 90 range of trickle ventilators have been. The Maxiglaze is available in made to measure sizes. 5mm. 49 each £5. 1206 713801 21 Details Ventilators EA figures above and marked on vents are achieved when fitted to manufacturer’s recommendations. Add to Basket. September 2023. General Sheet Metal Work /Residential Venting / Commercial Ventilation /. Titon has updated its range of trickle ventilators to include additional versions which comply with the recently revised Scottish Technical Standards – the equivalent of the England & Wales Building Regulations. This vent is capable of provding an Equivalent Area (EA) of 4600mm 2 when fitted with the XC16 Canopy. £9. These Trickle Vents are ideal for both new build or refurbished situations using any window material and is available in a variety of colours. PO Box 1244, Indianapolis, IN 46206 . The below is a Titon summary of the main points, please ensure you read the full documents for full implications. £707. . Window & Door Hardware. 1. Titon Inc | 226 followers on LinkedIn. Titon trickle ventilators are effective in single family dwellings as well as high rise commercial structures such as apartments, condominiums and hotels. Their performance is backed up by independent. This enables you to drill quite easy without ruining the wallpaper and getting grief from the other half. In dieser PDF-Datei finden Sie technische Daten, Abmessungen und Montageanleitungen für dieses Produkt. Airflow up to 59 l/s (212 m 3 /h) Suitable for bathrooms, toilets and kitchens. 93. Titon Hardware Ltd. nyck New Member. Decentralised Mechanical Ventilation Unit (dMEV) View. The Hi-Lift design improves the Trimvent range to offer increased ventilation. The trickle vent on the inside is controllable in that you can usually switch them on or off (not so for some installations like where gas vents are fitted as an example). • Simple condensation control. VAT. 0800 970 4190. How to fit trickle vents - a short guide. Making a Difference in Indoor Air Quality Titon Inc was established in 1989 to bring the concept of the integrated window ventilator also known as the trickle ventilator to the. Titon (UK) Titon (US) Vent-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. Trimvent SM vent is a surface mounted aluminum slot ventilator that fits over a maximum ½” slot in a window and provide a much healthier indoor air environment in the home and give the home occupants greater comfort and control in doing so. Very Good. 14 (£6. per page. com titon. Titon - The home of domestic ventilation systems and window & door hardware Passionate Indoor Air Quality Experts Manufacturers of whole-house ventilation systems and hardware for windows or doors. Titon Select S13 Plastic Trickle Vent (surface mounted). TitonDirect Sales. Titon's range of acoustic ventilation products, from basic acoustic slot vents, through dedicated acoustic trickle vents, to sound attenuating mechanical products and ducting. Titon Inc. Titon has maintained its position as the industry leader through constant research and product development, ensuring the company is still able to offer the largest range of trickle vents on the market today – having sold over 50 million vents to date. Trimvent 90 Hi-Lift Trickle Vent is a semi-recessed aluminium slot ventilator that fits over a 16mm slot in a window and provides an Equivalent Area Airflow of up to 4300mm² when fitted with the Trimvent 90 Hi-Flow canopy. With the updated edition of Part F released in December 2021 for implementation in June 2022. Finishes White and brownAluminium Titon Trimvent 90 Hi Lift Vent - Various Finishes. Condensation, carbon monoxide, and carbon dioxide. Free postage. 10 inc. Buy As Trade Add to Basket. Titon Inc. Aluminium Titon Trimvent 90 Hi Lift Vent - Various Finishes . CME2. External cowl reduces light and draughts. 94 (£13. Window Trickle Slot Vent White for UPVC & Timber Windows - 407mm. £34. All products are suitable for use on. 400mm. Quick Overview. Optimum performance over length requires fewer vents to be fitted to achieve total requirement. Manufactured in the UK this 4000 vent is a slimline window vent option where slots can be found on windows with narrower frames. Product width. A small fan is encased in the housing of the vent and runs continuously at a low. As the UK's leading supplier of trickle ventilators, we provide the most comprehensive selection of aluminium and pvc-u products, including glazed-in and slot ventilators. These Trickle Vents are ideal for both new build or refurbished situations using any window material and is available in a variety of colours. Titon’s trickle ventilators assist in compliance with ventilation regulations in the UK. 1. The units has a very large duty range: CME2 - 116l/s (418 m3/hr) at 200 Pa. Contact us to discuss your order: e: [email protected] 90 Hi Lift ist ein halbversenkter Aluminium-Schlitzlüfter, der über einen 16 mm breiten Schlitz in einem Fenster passt und eine äquivalente Fläche (EA) von bis zu 8600 mm² bietet, wenn er mit dem Hi Flow-Überdachung ausgestattet ist. 0 out of 5 stars 4. Gas Regulations ventilator can provide a Free Area of up to 5000mm2 permanent ventilation when fitted with a Gas Regulations canopy. Sold as an internal trickle air vent cover only. VAT) Order Quantity. Aluminium Titon TV90 Flat Grille 435mm x 30mm - Various Finishes. Product Code: 12572. If vent supplied with protective cover tape, do not remove tape until authorised. 748 inch) -White. A surface mounted plastic slot ventilator, the Titon Select S13. 29 Inc Vat. 0800 970 4190. Brand: SD Hardware. When there is no. Titon trickle ventilators are effective for improving indoor air quality (IAQ) in single family dwellings as well as high rise commercial structures such as apartments. Surface mounted and screw fixed to the frame these V4000SLIM vents are great for general replacement trickle vents are broken or missing. Home > Products > Window & Door Hardware. Tested in accordance with BS:EN 13141-1 (2004). Maxiglaze is an energy efficient glazed-in aluminium ventilator that provides an Equivalent Area (EA) of 12000mm² per metre of extrusion (equal to vent length minus 57mm). Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. . Acoustic ratings – see above. Acoustic performance tests by BRE Acoustics. This is a handy guide to help you though. Available in vent and canopy pre packs. Buy online and collect in store in as little as 1 minute. 8in² per louvered grill. 9 Item(s) Sort By. Trimvent 4000 Hi Lift is an aluminium slot ventilator that fits over a 13mm slot in a window and provides an Equivalent Area (EA) of up to 6000mm² when fitted with the Hi Flow canopy. VAT. Titon Trickle Slot Window Vent for uPVC Glazing, 2 x Exterior, 42cm, Brown, New. A surface mounted plastic slot ventilator, the Titon Select S13 Plastic Trickle Vent is ideal for new-builds or to be retro-fitted. Buy As Trade Add to Basket. Developed to provide optimum airflow for every window. co. Available in Ø100 mm, Ø120 mm & Ø150 mm. Buy Air Vents at Screwfix. Show. Air Brick: Terracotta, buff/sand, white, grey, blue/black, black, brown. Ventilation; Trickle Vent Canopies; Titon -XC16 Plastic Canopy - White; Zoom. Please make any allowances for fittings beads, gaskets etc, or for manufacturing tolerances. Please make any allowances for fittings beads, gaskets etc, or for manufacturing tolerances. Ventilation; Trickle Vent Canopies; Titon -XC16 Plastic Canopy - White; Zoom. 968. 33 White Titon Trickle Night Vent for Upvc & Timber Windows - S13 1700EA 267mm Long 2000mm² Our easy to fit white Titon trickle vents can be fitted to windows or doors (Upvc or timber), as an aid to. Designed to be either surface mounted or recessed finish has rounded ends and a tilting t-bar for air deflection control. A surface mounted plastic slot ventilator, the Titon Select S13 Plastic Trickle Vent is ideal for new-builds or to be retro-fitted. £1339. This plastic slot. co. Slot Size: Trimvent E18 Range – 3⁄4″ slot width: E18 4200 Internal Trickle Ventilator:. Price: £9. Metal Trickle Vents: Offer the Premium Vent Choice. ukTiton’s SF Xtra is a high performance, surface mounted aluminium slot ventilator. Where can i buy window trickle vents. Titon Inc. VAT. The XR16 is ideal for both new build or refurbished situations using timber windows and is available in a variety of colours. They are controllable, to give the option of having them open or closed. The company was founded in 1972 and has dedicated many years to. Ventilation Systems. Gas Regulations Ventilator. Discussion in 'Builders' Talk' started by nyck, Mar 1, 2004. Starting at: £11. SF Xtra Sound Attenuator, Liverpool and Manchester. Est. Product Codes TP325 - CME base only (First fix). The 13/16” dimensions are always constant; therefore the body length is always 1-5/8” shorter than the overall length. Buy white or brown colour options. It is the shortest vent available to give maximum airflow. Titon - XS16 Plastic Canopy - Various Finishes Group Code. Delivery. If vent supplied with protective cover tape, do not remove tape until authorised. Finish (inner and outer). Tighter homes and buildings with a minimum amount of air penetrating can have real indoor air quality problems. Product shape. We stock an enormous range of essential products specifically for. The vent is also available in made-to. uk AAC125HPCWL. Similar Products. Features & Benefits. It provides an Equivalent Area (EA) of 2000mm 2 or 4400mm 2 and can be fitted with a C13 Canopy or a GS13 Grille. Maxiglaze is an energy efficient glazed-in aluminum ventilator that provides a much healthier indoor air environment in the home and give the home occupants greater comfort and control in doing so. The S13 Trimvent Select is a surface-applied trickle vent with a sleek design and easy operation. Cost effective sound attenuating (acoustic) trickle ventilator. £4. A boost facility provides rapid extraction when necessary to remove higher levels of pollutants. Titon’s recent investment in new tooling and assembly machinery is now coming to fruition with a wider choice of options in its mainline plastic vent ranges. View. 5mm) - Brown. We can supply most products you may require as a joiner to make your performance windows function and be very secure. The Titon Slot Vent 4000mm² is designed with a night. 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. 894 The Crescent, Colchester CO4 9YQ United Kingdom. Trickle Vents, known also as background ventilators, are natural ventilation devices which can be integrated into façades or window systems as an alternative to operable vents, specifically in. e. The TV4000 Hi Lift is ideal for both new build or refurbished situations using any window material and is available in a variety of colours. FIRE DIFFUSER EXTRACT (100, 125 & 150 MM) For use with Titon‘s HRV Q Plus and CME Q Plus Ranges. 79 inc. The quality of the products available has resulted in Titon’s […]A further issue is that windows and doors utilise many industry “stock parts” for example Hoppe Handles on Doors, Winkhaus Handles on Windows, Cotswold Architectural or Securistyle Friction Stays or Titon Trickle Vents. 4. * Size 265mm x 18. Discussion in 'Builders' Talk' started by nyck, Mar 1, 2004. Independently tested by Sound Research Laboratories in accordance with BSEN20140-10:1992, ISO140-10:1991. 894 The Crescent, Colchester CO4 9YQ United Kingdom. Trickle Vents Grilles; Shop all Trickle Vents Grilles. TP303A CME 2 Q Plus Fan assembly only (Second fix). Any cooling of the internal temperature in winter from a trickle vent is marginal. Upvc Casement Tilt Turn Window Ventilation Restrictor Arm White Brown. Description - CME2 Q Plus Drawing & Dimensions Titon CME2 Q Plus whole-house central mechanical extract ventilation unit. V. Titon Hardware Ltd. VAT) As low as: £10. 92 +£6. Installing attic baffles can help reduce energy bills,. Improve indoor air quality by choosing our range of UPVC trickle vents in multiple sizes. NB: For optimum performance the ventilator should be installed on a flat surface free from defects, and sealant should be used along all edges to achieve the desired acoustic result. 50 a set, conform to Building regulations. Buy As Trade Add to Basket. All acoustic vent models have been independently tested in accordance with BS EN ISO 717-1:1997 (airborne sound insulation & BS EN 20140-10:1992). Aluminium Canopy - Various Finishes . Airflow up to 60 l/s (217 m 3 /h) at 100 Pa. Titon -XC16 Plastic Canopy - White. dewaltdisney New Member. Resources. Aluminium Trickle Vents. Titon has maintained its position as the industry leader through constant research and product development, ensuring the company is still able to offer the largest range of trickle vents on the market today – having sold over 50 million vents to date. Titon Trimvent Select S13 Trickle Vent (265mm x 18. The CME2 Q Plus is ideal for continuous extract of stale, damp and polluted air to the outside environment. Product diameter. VAT) Order Quantity. Spanners and Sockets. Titon Select C13 External Plastic Canopy for use with the Select S13 Plastic vent. . Fit most window types provided they are long enough! How to fit trickle vents - a short guide. A surface mounted aluminium slot ventilator. September 2023. Titon Hardware Ltd. £533. Surface Protection. 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. How to replace a motor in Titon HRV 1, 1. 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 SF Sound Attenuator 2500EA Canopy 25mm TA5202 464 35 54 3470 Ventilation Systems Sales. 48 (£5. Titon: Titon: Name of Patent: Ventilation Device: Slot Ventilator: Slot ventilator mounted on a window or door to be. Supply Ventilation. View All Aluminium Trickle Vents Looking to buy extra long trickle vents? A total length of 700mm! Buy the internal trickle vent separately and mix and match with external canopy hoods? See CAL8000 available from Related Products. Titon Hardware Ltd. com Titon offers a range of window vents for different materials, such as aluminium, composite, PVCu and timber. Skip to content. 4. Titon Inc is a subsidiary of Titon in the UK who are a leading innovator of passive ventilation systems sold throughout Europe. titoninc@titon. Dramatically reduce installation time with an this slimline slotvent with an innovative clip-fitSkip to content. Trickle vents should provide 4,000mm 2 EA in each habitable room: NOTE: The guidance for mechanical extract ventilation is suitable for highly-airtight dwellings only. Wind noise blowing across the vents if ours are anything to go by. Group Code: GR32. Titon Trimvent Select XS13 Trickle Vent - White. How to fit trickle vents - a short guide. Major building research bodies and energy efficiency programmes advocate the need for background. VAT. Titon’s CME MEV comes in four models in two different designs. Titon - Trickle Vent Select XR16 - Various Finishes; Zoom. shopping_cart Basket (0) Trickle Vents Chlo Products Vents Easy Vent Delta Vents Titon Reson Window Vents Greenwood Window Vent Templates RW simon Mighton Window Vents. Trimvent 4000 is an aluminum slot ventilators that fits over a ½” slot in the window and provides a much healthier indoor air environment in the home and give the home occupants greater comfort and control in doing so. Powered foundation vents are extremely effective in providing ventilation for moisture control. Titon Trimvent Select XC16 Canopy 364mm x 21. uk info@titon. The CPS 2000 vent consists of two main components, the external canopy with fly screen and internal with shutter providing an airflow of 2087mm2. Titon Trimvent Select XS13 Trickle Vent - White. Titon - Trickle Vent Select XR16 - Various Finishes. 04 psf (Vent and Canopy only) Water Resistance – in excess of 12. . More info. The purpose of trickle ventilators is providing a consistent flow of fresh air. No. A time served trickle ventilator found on most double glazing windows. View. Finish (inner and outer). Titon: Titon: Name of Patent: Ventilation Device: Slot Ventilator: Slot ventilator mounted on a window or door to be ventilated. Does any one know of a place i could buy a few trickle vent. . 14 (£5. com Legal. Quick Overview. The rankings reflect our opinion and should be a good starting point for shopping. Available in white or brown UV stabilised ABS for long, maintenance free use. | Titon manufactures and supplies ventilation and window and door hardware products – ranging from its signature Trimvent background ventilator to window handles, locking systems and hinge. Titon manufactures and supplies window and door hardware products ranging from background ventilators and window and door handles, to locking systems, hinges and restrictors. Its design ensures controllable trickle ventilation in line with current Building Regulations. Poor indoor air can result in accumulation of indoor contaminants resulting in sickness or illness. Buy window trickle vents, grilles and canopies at Construction Supplies, ensuring ideal window ventilation is provided to your property. Aluminium Titon TV90 Flat Grille 435mm. Quick Overview. Greenwood UPVC Trickle Slot Vent 2500EA 250mm Long White. Our easy to fit Greenwood 8000HD Trickle vents can be fitted to windows or doors (Upvc or timber), as an aid to controlling condensation. External cowl reduces light and draughts. Please view our Conditions of Quotation and Supply for Ventilation Systems Products. The provision of background ventilation in habitable rooms allows the introduction of fresh air into the living space to dilute odours and prevent condensation. Titon Hardware Ltd. One of the key benefits of the Titon metal trickle vent range is their durability – they are much less prone to abuse or over-use. 5mm (No. Sales and Technical Support +44 (0) 1206 713801 [email protected]. Titon Holdings Plc announced the appointment of Tom Carpenter as Group Chief Executive Officer . For Window & Door Hardware products Anglefix 3 Enterprise Centre Chapman Way Tunbridge Wells Kent TN2 3DRTel: +44 (0)1892 684422 Fax: +44 (0)1892 684433 [email protected]) - Brown. Titon Inc was established in 1989 to bring the concept of the integrated window ventilator also known as the trickle ventilator (or trickle vent) to the American market. 5 4400 5027 XS13 & XC13 4400EA Screw Fix Pack TS4134470 XS13 4000EA Vent Clip Fix TS1134071 411 18. Trimvent 2000 ventilators have been specified and fitted on millions of windows throughout the UK and mainland Europe for 25 years. Choose Options Add to Wishlist. Titon offers a range of window vents for different materials, such as aluminium, composite, PVCu and timber. Add to Basket. Ideal for both new build or refurbishment jobs. Trimvent Select S13 / XS13 FOR USE ON VINYL, WOOD, ALUMINUM OR FIBERGLASS WINDOWS. PO Box 1244, Indianapolis, IN 46206 . The Company offers natural ventilation (trickle vents) and hardware products for the window and door fabricator markets and mechanical ventilation products for the new build residential markets. enquiries@titon. Group Code: GR394. £533. Features & Benefits. £2. The quality of the products available has resulted in Titon’s. Flush Fit. Following the update to the Building Regulations 2010 (Part F1 Dwellings 2022), Titon has revised its popular ‘Part F 2010 Domestic Buildings Compliance’ CPD presentation to help gain a deeper understanding of the new requirements. One of the key benefits of the Titon metal trickle vent range is their durability – they are much less prone to abuse or over-use. Trimvent® 4000 Hi Lift. Titon has maintained its position as the industry leader through constant research and product development, ensuring the company is still able to offer the largest range of trickle vents on the market today – having sold over 50 million vents to date. Suitable for aluminum, wood and vinyl windows. Similar Products. TV90HL White Aluminium Vent 2500EA 300mm. The Trimvent Supervent is a solution that can be easily be incorporated into your system design that works at all levels. Suitable for aluminum and vinyl windows. Surface mounted vinyl slot ventilator. Suitable for Outdoor Use. Titon CME2. VAT) Order Quantity. per page. › See more product details. Titon SF Xtra Flat Fit Vent (surface mounted). Surfaced Mounted Slot Vent c/w. Fits 13mm slot in the head or the top rail of the window; Meets the requirements set by the Building Regulations F1. 08K subscribers Subscribe 60K views 9 years ago This short demo shows you how the Titon trickle vents can be opened and positioned against draughts to deflect the air flow up to the ceiling or. In Stock. Different manufacturers have different trickle vents designs as Greenwood trickle vents are a more direct open and close action compared to the Titon trickle vents which can. £1299.