Countersunk holes. Our range of Non-Vision Grilles models include: NV1: Standard flanged grille. 3. Download. Static Pressure 100. It may be surprising that just these three systems — mechanical, electrical and plumbing (MEP) — can make up as much as 15% of the total environmental footprint of a building's materials. Door Transfer Grilles. The air transfer grilles are connected, via a control panel, to a standard fire alarm system. SG-SD. 6171Revision: Date: Units: Page: Model: ® OF Submittal: XG-DGDFSS Stainless Door Grilles Door. If transfer grilles or jump ducts are used, refer to the balancing report provided by the HVAC contractor for the bedroom air flows to size the grilles or ducts. comDoor Grille TROX (South Africa) (Pty) Ltd. Cover grille (not included) Duct SERIES FB Door, Wall & Partition Mounting Intumescent Fire Dampers Gilberts FB Series provides a compact, eficient range of intumescent ire dampers designed to satisfy all types of air transfer application in ofices, shops, schools, hospitals and many other commercial projects. 005 150. Registered in England and Wales: 673483. In many cases, pipes and ducts. The aluminium ‘V’ shape chevron blade mounted on a close 8mm pitch renders see through vision impossible and when double banked in a matt Grille Options & Accessories. Home; Fan Finder;Non-vision air transfer grilles, made of aluminium, with fixed horizontal blades. AG10 Bar Grille. Fisher & Paykel 48" Grill with Infrared Sear Burner, Natural Gas - BE1-48RCI-N. Extensive product range. All manufactured from 1. Battic Door 20 Patterson Brook Road – Suite #7 West Wareham, MA. London’s Decorative Metalwork and Metal Grille Specialist. Clean-room diffusers. The damper can be suitably masked on both sides either with steel type A grilles or aluminium non-vision type B grilles. The above-door transfer grille simply has two grilles located above the door between the room and common space, one on each wall, with offset baffles to limit sound transmission. 65mm thick Zintec mild steel with Zintec clips. The faceplates areFire and Smoke Resistant Dampers / Air Transfer Grilles System Benefits 3 Product Range 4 - 5 Operation 6 Lorient Smoke Control Systems 6 - 8 Product Solutions 9 - 18 - Doors 13 - 14. 1. 5 inches (38 mm) or the closet shall include a louvered door or transfer grille with a minimum net free area of 30 square inches (194 cm 2). Intumescent air transfer grilles to satisfy air transfer application in doors or walls. co. 6 inches : If the free area of grille is %, and side (a) is" , side (b) should be: 3. Take a flow hood and check cfm with the door open and the door closed, with a 1" undercut on a bedroom door you will have a serious cfm drop. Single & Double Deflection Grilles. Gilberts NV Series provides a comprehensive and traditional range of vision proof grilles to suit all manner and type of air transfer application through doors, walls and partitions. press machinery and production techniques the FB700 is<br />. SG-PS. Lorient Intumescent Air Transfer Grilles are suitable for ventilation in fire compartment walls or doors. GILBERTS DAMPERS 8 MAY 2005 PUBLICATION Features 60 or 120 Minute Fire Rating. 2. Non-vision door transfer grilles are two piece grilles designed to be installed in doors or partitions. We are also able to custom fabricate products to suit your specific architectural requirements. This is partly due to a privacy issue. 1 KB Views: 234. From standard grilles and registers, to its architectural line of Formations® linear slot diffusers, along with a newly released series of displacement. Flush mounted ,non vision door or partition grille. Domestic Warm Air Heating Grilles. 004 0. Operation: The units are operated by a 24V DC electrical supply. Air Velocity : 75 m/s. Their special features make them ideal for placing in doorways and interior walls. Blades are chevron in configreation and are mounted in a fixed position ina rigid PVC track in an integral part of the frame. Catalogue DIFFUSER. Duct 6. IMG_0186. This will reduce moisture problems and help eliminate mold and mildew build up. Polyaire Product Catalogue - Door Relief Grille. We supply a range of Stainless Steel ventilation grilles, trickle vents, hit and miss vents. 4 out of 5. Gilberts FB700 Series presents a range of Mild Steel Louvred Grilles designed to satisfy all types of air transfer application in offices, shops, schools, hospitals and many other. Uniclass Code : Pr_70_65_04_03. 004. Nailor 51DG and 61DG Series Door Grilles are designed to be. 4. Share. 020 inch water column) is acceptable for rooms with a design airflow ≥150 cfm. The high-low offset is located in an interior wall framing cavity adjacent to the door between the room and common space. Excellent for installation in doors or partitions. The above-door transfer grille simply has two grilles located above the door between the room and common space, one on each wall, with offset baffles to limit sound transmission. uk . 6. They offer a large free area for great performance yet have a sight proof design. Door, Wall or Partition Mounting. Sort by. Nominal sizes 225 × 125 – 1225 × 525 mm. Reply to. 010Gilberts Non-vision Louvred Grille provides optimal airflow performance. This may cause the damper to scream. Stainless Steel Door Grille with Single Flat Frame (Auxiliary Frame, Dual Core) The 9700 series transfer grilles are designed to ensure visual privacy while providing air circulation from one area to another. Type NV6 Vision proof flanged grille suitable for surface mounting onto doors, wall or partitions. 001 0. Product 150 Intumescent Ventilation Grilles (SVG & HMG)blades. Speci˚ed Door Opening Speci˚ed Door Opening - 1/8 1 5 16 2 13 32 Model : XG-DGCO ( Door / Transfer Grille - Core Only ) Model : XG-DGSF ( Door / Transfer Grille - Single Flange Frame ) Model : XG-DGDF ( Door / Transfer Grille - Double Flange Frame ) Model : XG-DGLP ( Door / Transfer Grille - Light Resistant ) Face View ( Models: XG-DGDF &Lorient has been developing high quality intumescent air transfer grilles for over 40 years; combining air movement with fire protection & making buildings s. Designed for. Height : 1005 mm. Gilberts NV Series provides a comprehensive and traditional range of vision proof grilles to suit all manner and type of air transfer application through doors, walls and partitions. £7. 2. 4. Aluminum door grilles. 8 m 2), the closet door shall be undercut a minimum of 1. Smoke, Fire and Volume Control. 1 Double Defl ection Grille AUR 6 1. Tamarack Technologies, Inc. For both fire and smoke protection, see the Lorient LVN20S Air Transfer Grille. Discreet, but attractive, this robust extruded aluminium grille incorporates a slotted, linear airway across its length and locates at the bottom of the door. TRH (Transfer grilles) 1. ; Transfer grilles shall use 50 square inches (of grille area) to 100 cfm (of. The Lorient LVN20S intumescent air transfer grille system contains both fire and smoke in the event of a fire while also allowing good air flow through doors during everyday use. 5 Egg Crate Grille (13Mm) AEC 23 1. 033. The high-low offset is located in an interior wall framing cavity adjacent to the door between the room and common space. 11 of this code. Using the same intumescent louvred slat configuration as the LVN20, but incorporating an electro mechanically operated smoke shutter mechanism. Steel Maximum Security Grille with Square Perforations. That does not even come close to the negative pressure issues it throws the rest of the home into. Save. The LVN20 is a non-vision intumescent air transfer grille. ft. Such spaces include storage rooms and restrooms. Published by Raúl Galdrán from BIMETRICAL on 1/8/2018. $4000. Where return air is taken from a closet smaller than 30 square feet (2. Cam-Motion®. Now I am down to the transfer grille or the jumper duct. The Waterloo adjustable, single and double deflection grilles are suitable for duct, ceiling and sidewall applications in most commercial projects. uk HomeThe ATG/BF comes complete with mounting flange plus a loose telescopic rear flange to suit a minimum thickness of 42mm up to a maximum thickness of 110mm door or partition. or use our online contact form. Genuine Comfort find that air return grilles tend to be the better choice between transfer grilles and air return grilles. The Halton TVC transfer grille can also be used together with an opposite frame accessory (OF) to complete transfer unit for 25 to 50 mm thick doors or partition walls. AGS-T read more. 10 Wigford Road Masons Mill Pietermaritzburg Tel. Commercial Grilles, Registers and Diffusers. Standard finish is natural anodised while other finishes including powder coat are available to suit the interior and architectural design requirements. The grilles are carefully constructed to be unobtrusive in appearance for architectural excellence. Construction Details All Dimensions ±1/16" Standard Finish: 01 White Finish 24 Mill Finish Optional Finish 02 Satin Silver 03 Black 28 Custom Color Extruded Aluminum Constructionjinteriordesignonline. Even more important is the operation of these systems, particularly mechanical and plumbing. Inverted V type grille bar for best vision proof quality and airflow. Exterior Stainless Steel Safety Door Grill, For Home ₹ 900/ Square Feet. Lorient Code of Conduct. Download. Pyrogrille air transfer grille allows free air flow and provides up to 60 minutes fire protection. Feb 13 2020. My 1st choice would be jumper ducts for aesthetics and better air volume capabilities. Width : 1025 mm. New Build Residential sales:. The LVH44 dampers can be assembled in multi-modules to protect large. Aluminum Transfer Grille (ATG) Overview. Air transfer grilles for fire doors. Every intumescent grille contains a moisture-resistant intumescent core held in a galvanised steel frame for security and long-lasting use. Gilberts are a local, trustworthy company based in Gosport who have been offering a wide range of services. The 2 most practical options are soundproof blankets and soundproof curtains. ) Ak Factor Core Velocity Velocity Pressure Neg. Send us a messageDG-3 - Double Flange Door/Transfer Grille. 1"x3. To contact us please call: +44 1253 766911. 55 KB: Preview: waterloo-air-products-plc_ns-non-vision-transfer-grilles_photo_3_d32b8ba8-bdc8. Transfer grille examples to alleviate pressure differences. A range of grille sizes can be produced from two modules of size 150mm by 150mm and 225mm by 112mm each 40mm thick. Returns are complicated much more so that the supplies. A definitive guide to operating theatre diffuser selection in accordance with HTM-03-01. Allows for air transfer through doors or walls. Designed for installation into fire resisting doors, walls and ducts. 47 L/s) for each 50 square feet (4. 1 800 222 5932. Model Series 51DG offers the largest free area possible (average > 50%) with a completely sight-proof. Air volume q v: Discharge velocity V k : Outlet size : Effective Pressure Area A k : Air volumes are given in mt3 / sec. Manufacturer : Madel. 4. The range is available with a wide variety of frame and fixing options to suit various design needs. For more friendly and professional advice on air grilles, please get in touch via our contact us page or give us a call on 01842 765657. 7 Curved Blade Register ACB 29 1. introduced through air transfer grilles mounted in the 2 doors that give access to the ward. The LVN25 is a non-vision intumescent air transfer grille. I just finished building a new home and as part of the Energy Star rating transfer grilles were installed above each of the bedroom doors to allow air exchange when the doors are closed. Catalog. 4 Dimensional Data Hole - 4mm dia. Long throw, high capacity supply grille with rotating drum. Door Transfer Grille • 51DG, 61DG • Word Document [. Acoustic vent grille to allow ventilation whilst reducing sound transfer from room to room. Series GECA-RC Removable Core Eggcrate Grilles. On the roof, 3 number penthouses, ranging from 1m x 1. Gilberts NV Series provides a comprehensive and traditional range of vision proof grilles to suit all manner and type of air transfer application through doors, walls and partitions. Iron Maindoor Laser Safety Grill, For Home ₹. 9 Slimline Weather Louvre AWLS 37 1. Lorient Intumescent Air Transfer Grilles are used to provide an answer to situations where ventilation is required in fire compartment walls or doors. Send us a messageFire and Smoke Resistant Dampers / Air Transfer Grilles System Benefits 3 Product Range 4 - 5 Operation 6 Lorient Smoke Control Systems 6 - 8 Product Solutions 9 - 18 - Doors 13 - 14. 065 400. Ideal for low velocity air handling systems, it can be operated as a stand-alone unit. 304 Stainless Steel Construction (Optional 316 Stainless Steel) Z-Shaped Deflection Vanes Set on 1” Centers. 35m3/s TYPE GFX/600/1 Max pressure drop of 3 Pa required. SERIES OPTIONS WGF/75:Comprises of 16 SWG LouvresThe grille is also suitable as a general replacement for 600sq floor tiles where areas of heavy foot traffic and equipment would be experienced. Gilberts has built a reputation for providing an extensive range of contemporary, value engineered products at the best in competitive. Du ctodamp esl v ni 7. PERFORMANCE DATA STG Core Area (sq. * Note: 30mm protrusion with minimum depth of door DSR/425/285/9010-Matt Type Nominal width Nominal height Finish ORDER EXAMPLE Nominal W x H + 51 Nominal W x H - 25 60 Nominal W x H 40. 3 (7) Download. with a door sleeve and electrical door wiring loop for a 45mm or 54mm door or a wall sleeve only, for a wall/partition. Allows for air transfer through doors or walls. Even more important is the operation of these systems, particularly mechanical and plumbing. The 61DG Series Door Grille may also be used as a transfer grille and in place of standard design exhaust and return air grilles where it is important that the interior of the plenum or duct be concealed. TYPE GPS4 & GPP4 -Air supply or extract grille fascia for applications using a seperate plenum box. GILBERTS Head Office and Works GILBERTS (BLACKPOOL) LTD Gilair Works, Clifton Road, Blackpool. The easiest way to reduce noise traveling through them is to cover them with an absorptive or sound-blocking material. 603. We are the world's oldest manufacturer of decorative metal grilles. To be used where air movement/flow via fan is stopped in the event of a fire. <br><br>The Perfect Balance In-Door Return Air Pathway is designed to maintain adequate air flow between rooms and eliminate pressure imbalancesallowing each room. Available Options 4. X. 001. 010. Introduction Gilberts AV1601 Series presents an attractive alternative to traditional vision proof door mounting air transfer grilles. When posting in certain forums, knowing your location will. £7. pattern: vision proof inverted ‘v’ shape horizontal cross section blades arranged to overlap each other. 005 150. Available in either steel or aluminum construction with either single or double flange frame options. The solution - Remove the face damper installed near the register or grille and. Minimum size is 6" x 4" (152 x 102). Discreet, but attractive, this robust extruded aluminium grille incorporates a slotted, linear airway across its length and locates at the bottom of the door. We are the world's oldest manufacturer of decorative metal grilles. The supply vents, which push air through the duct work, must be placed properly. The Perfect Balance and Return Air Pathways. Jackshaft (indicates damper positioning) 9. Fisher & Paykel 48" Grill with Infrared Sear Burner, LP Gas - BE1-48RCI-L. 008 0. The problem is that sound (and a small amount of light) pass freely through the vents negating all privacy of closing the door. EI rating of 120 minutes when used. AGS-T. Because transfer grilles connect two rooms or a room and a hallway, there is nothing that is blocking sound between the two areas. The DGC is manufactured as per the DG but in a channel frame. Clearance dimension 430x75 mm. All-in-one intumescent block grille with faceplates. General. Save4. Series SK Heavy Duty. With this new Series Gilberts provide a comprehensive range of stainless steel grilles and diffusers designed to suit the most demanding of projects. 3. The air transfer grilles are connected, via a control panel, to a standard fire alarm system. transfer grills over doors to bedroom/office. Available in nominal 1" (25) increments. The air vent grille cover can be door or wall mounted and is made from quality 20swg mild steel. 6" Inch Door Air Vent Grille Two Sided Ventilation Cover - White - Overflow Ventilation Grill - Door Vent Cover - Free AIR Flow Between Rooms - Package of 2-450mm x 92mm Engera Bathroom Door Air Vent Grille Two Sided Ventilation Cover for Restroom, Warehouse, Storage Doors | Interior Door Transfer Grill 453mm x. Suitable for use in doors, Modern Slavery Policy. Can provide up to 60 minutes fire +. These are particularly suitable for doors to staircases etc. Still family owned Gilberts operates from its 120,000 sq ft manufacturing base in Blackpool, Lancashire with an annual turnover in excess of £20 million. for applications where the grilles need to withstand abuse. Model includes a v-shaped louver providing a sightproof return or exhaust grille regardless of the viewing angle. THE name in air distribution products, providing engineered solutions to air distribution projects for over 60 years. Showing 11 of 122 products. These are often used in bathroom doors and mechanical room doors for the purpose of allowing make up air to enter the room when the fan is on and the door is closed. A. 6 SERIES GP Security Grilles 150 200 250 300 400 500 600 PIVOT LINE GRILLE HEIGHT - mm ALTERNATIVE SIZE FROM PIVOT 150 POINT 200 250 300 400 500 600 GRILLE WIDTH - mm 100 50 40 30 20 10 5 4 3 2. Skip to contentThe IFD-D intumescent door grille kit is suitable for new or existing Proprietary fire resistant doorsets that may require air transfer or pressure relief. 006 0. or use our online contact form. Lattice and perforated security grilles reduce the risk of damage and disassembly associated with traditional grilles in secure areas. 81 + VAT. Typical Building Sector : Commercial,Dom. Recommended price. Grille face made of aluminium with powder coat finish. HVC Supplies offer one of the widest ranges of grilles, diffusers, louvre systems, volume control dampers and fire dampers available from any UK manufacturer, with our range being constantly expanded to suit new industry requirements and customer demands. Compare. Also, there is NO indication of the how to determine the required size of the permanent openings of any type. NV3 is a Vision proof core in 32mm flanged border with matching telescopic back flange. Private conversations and loud noises can easily be. 14" x 14" White Aluminum Transfer Door Grille w/ Frame (TGF Series) Compare. - Wide 33mm Flange Border. DESCRIPTION: Construction: Frame and blades are 6063 extruded aluminum alloy with 200-R1 satin anodized finish. Grille face made of aluminium with anodised finish. Door undercuts are often obstructed by carpets further reducing return pathways. Original plan was to take my central air return in the hallway and stub ducts in the attic to get individual air returns to each bedroom. . Steel Maximum Security Transfer Grille with Rounded Perforations. With high quality and competitive pricing these grilles form the back bone of a standard offering that will meet any application requirements. 30 mm wide front border. Performance cannot be guaranteed where alternative plenum designs are used. Ventilation grille with angled blades. Transfer Grille. Additionally, fire rated air transfer grilles that have only been tested with cover grilles, must be installed with the tested cover grille design as a complete unit. Bright White or Satin Anodized finish. We can supply vents in a bespoke design to suit your requirements. door transfer grille. 0 metres per second, thenGRILLES AND REGISTERS F DOOR/TRANSFER GRILLES PERFORMANCE DATA: DOOR/TRANSFER GRILLES – 5100 AND 6100 SERIES MODELS: 51DG, 61DG Listed Duct Size (inches) Alternate Sizes (inches) Core Area (sq. It should not beSupply grille of horizontal-vertical double deflection with air flow regulation incorporated_RTHV . DSR units may be used in series to increase transmission loss. A fire-rated version is also available. Series L Linear Bar Grilles. 3. Share. The Waterloo fire rated ventilators are suitable for 1 hour rated doors and partitions. Door Transfer Grille Ordering Specification Sizing Finish Introduction Gilberts AV1601 Series presents an attractive alternative to traditional vision proof door mounting air transfer grilles. Slim-profile, versatile intumescent block grilles for use in ceilings, doors, walls or ducting. Discover our wide range of products within the Door grilles category and benefit from 20+ years of expertise Personal advice Competitive prices. Downloads. docx] Performance Data. 008 0. A transfer grille or grate is a panel or fitting with an opening allowing air or sound to move from one room to another. Paul_Ott 2 yr. Jet diffusers. We are also able to custom fabricate products to suit your specific architectural requirements. Use with 44mm Liner for FD30 doors & 54mm Liner for FD60 doors. centrally located return air of which you can. The Gilberts non-vision stainless steel louvred grille is suitable for surface mounting in both door and wall applications and is ideal for both standard air transfer and fire rated applications where intumescent type fire dampers are utilised. Our range of combined intumescent fire + smoke air transfer grilles can be used in all applications where cold smoke containment is required. Submit a request online and get a quote from your local representative within 4 hours. For installation information not covered in this sheet, refer-ence appropriate damper basic installation instructions. SERIES FB700 Air Transfer Grille Gilberts. Download Now. The air vent grille cover can be door or wall mounted and is made from quality 20swg mild steel. From the GFX/600/2 & 3 sizing chart this indicates a unit with approx Max Vol of 175 l/s. Designed for door transfer in dark room/light proof applications. Over the years we have built a reputation for providing an extensive range of attractively styled, contemporary, value engineered products at the best in. Established in 1972 in the family garage, HVC Supplies has developed steadily over more than 45 years to become the industry leading company it is today. Series GAwith a door sleeve and electrical door wiring loop for a 45mm or 54mm door or a wall sleeve only, for a wall/partition. air transfer grilles can be used in all applications where cold smoke containment is required. They allow free movement of air but allow no sight of one side from the other. With minimum and maximum security options as well as a variety of mounting types, these grilles are suitable for supply and return applications. Alternatively, please contact TENMAT for details of suppliers of finished grilles complete with steel frame and steel faceplate louvres. 1 Find Your Rep. are passive as door opening is allowing air. Introduction. Allows window to remain and door closed for a room when operating a whole house fan. Can be used to provide resistance to fire and hot smoke of up to 60 minutes in doors and walls. V-shaped Deflection Vanes Set on 1/2” Centers. 54 KB: Preview: waterloo-air-products-plc_ns-non-vision-transfer-grilles_photo_1_a22cec27-d4cd-42c6-aff5-75aabd21432a. ATG. The range is available with a wide variety of frame and fixing options to suit various design needs. Uniclass Code : Pr_70_65_04_03. They are available in a wide range of colours and finishes and are face fixed to walls or doors providing a cost-effective solution. GRILLES AND REGISTERS F DOOR/TRANSFER GRILLES PERFORMANCE DATA: DOOR/TRANSFER GRILLES – 5100 AND 6100 SERIES MODELS: 51DG, 61DG Listed Duct Size (inches) Alternate Sizes (inches) Core Area (sq. Designed for door mounting. ft. This is partly due to a privacy issue. Optional equipment and. Includes Grille, Installation Screws, Baffle, Sheet Metal Housing. Rack and pinion. TransShield ACS is a slimline non-vision intumescent fire and smoke damper with a unique sliding plate smoke control system. The sight–proof blade configuration and unobtrusive appearance make Krueger’s 9700 series grille an ideal choice for wall or door air transfer from room to room. These airflow volumes are then used to size and lay out the ducts. NV6 is a Vision proof flanged grille suitable for surface mounting onto doors, wall or partitions. 01924 444 174 [email protected] could be soil gases such as radon or fumes from paints, pesticides, or fuel stored in the crawlspace. robustly fabricated from 20swg mild steel and comprises of<br />. Lancashire FY4 4QT. BBB Accredited Door and Gate Operating Devices near Victoria, BC. Air transfer grille FGS - type MMS represent passive fire protection, designed with the help of compartmentalization to prevent the spread of toxic gases, smoke and fire. Extract air diffusers. Manufactured using modern<br />. NV2 Grille. RETURN EXHAUST GRILLES FIXED BLADES AT 35° DEFLECTION — STEEL Steel, double deflection supply grille, 3/4" blade spacing, front blades parallel to short dimension. Over the last 135 years we've produced architectural quality metal works for some of the biggest brands on the planet, yet we don't forget our. 001. NV4: Slimline surface mounted with a non-chevron blade, designed to suit fire doors. Lancashire FY4 4QT. Contact Us. Designed to be fitted in doors, walls and ducts they provide a cost effective solution in allowing free air movement and yet maintain the integrity of the door or wall in a fire situation. email: [email protected]. GILBERTS Head Office and Works Gilberts FB Series provides a compact, efficient range of intumescent fire dampers designed to satisfy all types of air transfer application in offices, shops, schools, hospitals and many other commercial projects. The standard finish will be RAL9010 or polyester powder coated to. , offering a complete line of air distribution and air terminal products. The DGA4 vents in the toilets feature a louvred face for a horizontal air pattern. Bespoke designs, priority order and guaranteed delivery dates. From standard grilles and registers, to its architectural line of Formations® linear slot diffusers, along with a newly released series of displacement. Supplied in 2. Blades are chevron in configreation and are mounted in a fixed position ina rigid PVC track in an integral part of the frame. “While undercutting doors can create part of the return air path, wall transfer grilles or jump ducts should be installed to prevent the return problems,” the Building Science Corporation warns. 4. If one grille is to be used per door then the volumetric flow needed will be: 1152/2 = 576 cubic metres per hour. If the grille is installed close to the fan, a damper may need to be closed to direct air farther from the fan. Over the last 135 years we've produced architectural quality metal works for some of the biggest brands on the planet, yet we don't forget our. the transfer grills. London’s Decorative Metalwork and Metal Grille Specialist. For example an air transfer grille tested only in a masonry wall or duct termini is not necessarily acceptable for installation in fire doors. Over the last 135 years we've produced architectural quality metal works for some of the biggest brands on the planet, yet we don't forget our. Typical Building Sector : Commercial,Dom. 5mm. sales@gdl. Product SA - Search A-Z Find out quickly and simply. For air transfer applications, the channel section core with integral noise absorption. 4 Dimensional Data Hole - 4mm dia. High – low transfer grilles. Air Distribution | GDL Air Systems Limited | England ATG. The LN linear bar grilles have bars fitted flush with the flange face, angled at Capital Building to 15degrees to ensure airflow without draughts. Install the Pyroplex Fire.