We are committed to clarity in pricing which is unambiguous although this Site does not contain any pricing information. 0 ( 0) From £45. e. Fire grilles look just like ordinary ventilation grilles, but can stop air from flowing into a fire by self-sealing as the temperature rises. Inverted V type grille bar for best vision proof quality and airflow. A transfer grille is a grille or register installed in the wall or above the door to connect the closed room with an open space such as a hallway or living room, thereby providing an. Coat Hook Remove all hooks behind doors, in wardrobes, etc. com 0344 856 0590. LVH20S intumescent fire + smokeThe Ligature Resistant Retrofit Exhaust/Supply Grille is designed to replace existing grilles that are not ligature resistant. Because transfer grilles connect two rooms or a room and a hallway, there is nothing that is blocking sound between the two areas. Displacement diffusers. View Products. 006 0. jpg. Gilberts Series SS ‘Airsteel’. H Nominal grille heigh t. Use two needle nose pliers and adjust the louvers to a more open position. 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. It should not beSupply grille of horizontal-vertical double deflection with air flow regulation incorporated_RTHV . Volume flow rate range 2 – 850 l/s or 7 – 3060 m³/h. Discreet, but attractive, this robust extruded aluminium grille incorporates a slotted, linear airway across its length and locates at the bottom of the door. 6" Inch Door Air Vent Grille Two Sided Ventilation Cover - White - Overflow Ventilation Grill - Door Vent Cover - Free AIR Flow Between Rooms -. The air transfer grilles are connected, via a control panel, to a standard fire alarm system. Allows for air transfer through doors or walls. ) Ak Factor Core Velocity Velocity Pressure Neg. 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. Lattice and perforated security grilles reduce the risk of damage and disassembly associated with traditional grilles in secure areas. Please watch our corporate video. 0 ( 0) From £45. 26-mm standard frame. Introduction Gilberts AV1601 Series presents an attractive alternative to traditional vision proof door mounting air transfer grilles. Tour de Competence Competence - exciting staged. and is greater in size than transfer. 40 + VAT. Available in nominal 2" (51) increments. 51DG 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. Available lengths: 72, 97, 147, 197, 222, 247, 297, 347, 397, 447, 497, 547, 597, and 1000mm. In the event of an alarm condition, or power failure, the smoke shutters shut, preventing the passage of cold smoke. Jet velocity is approx 1. 301. are passive as door opening is allowing air. Enter SIte. Both the Halton TVC grille and opposite frame are screwed to the wall or door. It adjusts to suit a door thickness from 1-3/8" to 1-7/8". The face velocity through return grilles with 'V'core should not exceed 2m/s. 19. Minimum size is 6" x 4" (152 x 102). Transfer grilles are designed for use in doors and partitions to allow for smooth transfer of air between spaces. The Perfect Balance In-Door Return Air Pathway is a grille installed into the bottom. Normally, with a single RA grille that'll be where the filter is. Both the Halton TVC grille and opposite frame are screwed to the wall or door. uk . Introduction. View Products. 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. 65mm thick Zintec mild steel with Zintec clips. Optional equipment and. 01457 861 538. 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. 006 0. Blades are chevron in configreation and are mounted in a fixed position ina rigid PVC track in an integral part of the frame. 012 200. DL. Transfer grille examples to alleviate pressure differences. ×. 71 inchesTransfer Grilles should not be fitted on doors which are required for smoke sealing compliance. 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. ft. This is partly due to a privacy issue. A definitive guide to operating theatre diffuser selection in accordance with HTM-03-01. 14" x 14" White Aluminum Transfer Door Grille w/out Frame (TG Series) ADD TO CART. 005 150. Extract air diffusers. My question is, can you essentially install a duct from the location of the grille, to somewhere else inside the house? (for instance down a hallway, it will still have a vent for air return, just moving that away from my actual. 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. Discreet, but attractive, this robust extruded aluminium grille incorporates a slotted, linear airway across its length and locates at the bottom of the doorsingle doors, double doors and louvre screens. Non-vision air transfer grilles, made of aluminium, with fixed horizontal blades. Construction is from all aluminium extrusion with fixed full chevron blades. 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. Our range of Non-Vision Grilles models include: NV1: Standard flanged grille. 57 (29 grilles required) 0. Door/Transfer Grilles. 5mm. Model includes a v-shaped louver providing a sightproof return or exhaust grille regardless of the viewing angle. Commercial Grilles, Registers and Diffusers. Gilberts Supply Diffusers have been tested within the range of +/- 10ºC (as recommended in the HEVAC Guide to Air Distribution Technology). Gilberts Blackpool. Designed for installation into fire resisting doors, walls and ducts. air transfer grilles can be used in all applications where cold smoke containment is required. email: [email protected]. 61EC - Steel Frame, Eggcrate. Gilles Gilbert was born on March 31, 1949. Gilberts NV Series provides a comprehensive. Download. 6 inches : If the free area of grille is %, and side (a) is" , side (b) should be: 3. Our combined intumescent fire & smoke air transfer grilles can be used in applications where cold smoke containment is required. or use our online contact form. Download. frame: telescopic frame suitable for doors or partitions from 25 – 55 mm thickness (fixed on both sides of the door) material: extruded aluminium profile for frame and blades: sizes:Above door transfer grilles. We are the world's oldest manufacturer of decorative metal grilles. 5m/s and NC level less than 15. Opening for the transfer of ambient air between two adjacent areas is referred to as a “Air Transfer Opening. Product, Technical. Wrapping up smoke and fire protection with our range of Fire Dampers, Smoke Dampers, Smoke/ Fire Dampers, Intumescent Air Transfer Grilles and Air Volume Control Dampers all developed to the latest test standards. 1 (7 reviews) Extruded aluminum grille supply. Product SA - Search A-Z Find out quickly and simply. Name. 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. Behind the scenes, numerous FB700 door transfer grilles and NV (non vision) were installed to maintain fire compartments, with FBL60 (one hour intumescent) fire blocks for optimum safety. SCHAKO sight-proof transfer grilles are overflow grilles for walls and doors and are used between two adjacent rooms for pressure compensation. The. View Product. GILBERTS Head Office and Works GILBERTS (BLACKPOOL) LTD Gilair Works, Clifton Road, Blackpool. 012. Clean-room diffusers. Cam-Motion®. A transfer grille or grate is a panel or fitting with an opening allowing air or sound to move from one room to another. V-shaped Deflection Vanes Set on 1/2” Centers. Used to allow for air movement between two conditioned spaces while preventing vision. We take great pride in offering an exceptionally high level of customer service and in building long-term relationships with our clients, whether they be consultants. com: return air grille for doors. Gilberts’ NV3 door transfer grilles allow Regulatory flow of fresh air whilst being vision proof. The DGC door transfer cavity grille are the most economical form of grilles for partitions, panels or sliding doors. Nailor 51DG and 61DG Series Door Grilles are designed to be completely sight proof and unobtrusive in appearance. Fabricated in a plain industrial grade 304 and 430 stainless steel the units are very robust and are suitable principally for Acoustic, smoke + fire containment systems. for applications where the grilles need to withstand abuse. 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. transfer of room air to another, i. duct or transfer grille), and perimeter walls insulated in accordance with Section N1102. Transfer grilles, door undercuts and wall grilles are all acceptable means to allow air to flow around the house. 008. 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. Air Distribution | GDL Air Systems Limited | England ATG. Domestic Warm Air Heating Grilles. 2. 450x92. ALN, ALM, ALF, ALG, ALJ Airline Linear Grilles 14 APF, APG, APJ, APN, APM Plasterline Linear Grilles 16 UC / UF / UE Urban Grilles 17 Door / Sidewall Grilles NS, DV, NSNL Air Transfer Grilles 18 DSR, DSRX Acoustic Air Transfer Grilles 19 T P W Ss e l l i r G l l a w e d i 20 WFV, WFVG Fire Rated Air Transfer Grilles 21 Floor GrillesWaterloo transfer Grilles are suitable for mounting in doors, partitions and Walls to allow ventilation air to pass between adjacent rooms. Sight-Proof Door Grille. ) Ak Factor Core Velocity Velocity Pressure Neg. Available in a standard grid size of 1/2" x 1/2" x 1/2" with 1/2" x 1/2" x 1" or 1" x 1" x 1" grids optional. Colour : Buff,Silver,White. Gilbert's Delicatessen, Guelph, Ontario. Door/Transfer Grilles. Manufacturer : Madel. Series L Linear Bar Grilles. The DGA4 vents in the toilets feature a louvred face for a horizontal air pattern. . Jackshaft (indicates damper positioning) 9. Ventilation grille with angled blades. Flush mounted ,non vision door or partition grille. Steel Maximum Security Suicide Deterrent Grille. 4. One grille is located high on the wall on. Tamarack Technologies, Inc. 98 -9%. Grilles, Diffusers, External Louvres, Smoke Dampers, Fire Dampers, Volume Control Dampers. 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. Even more important is the operation of these systems, particularly mechanical and plumbing. supplied by Gilberts with each Grille batch. Aluminum Construction. Includes Grille, Installation Screws, Baffle, Sheet Metal Housing. 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. Clearance dimension 430x75 mm. 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. Discreet, but attractive, this robust extruded aluminium grille incorporates a slotted, linear airway across its length and locates at the bottom of the door. Download. Door grilles are required for the transfer of air from one room to another Material Door grille manufactured from. Registered in England and Wales: 673483. 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. 6" Inch Door Air Vent Grille Two Sided Ventilation Cover - White - Overflow Ventilation Grill - Door Vent Cover -. We are the world's oldest manufacturer of decorative metal grilles. O. A transfer grille or grate is a panel or fitting with an opening allowing air or sound to move from one room to another. An electromechanically operated shutter smoke mechanism closes its slats in the event of a fire alarm going off, thus stopping cold smoke and flames from passing. My 1st choice would be jumper ducts for aesthetics and better air volume capabilities. A range of grille sizes can be produced from two modules of size 150mm by 150mm and 225mm by 112mm each 40mm thick. +27 (0)33 398 1006 Fax. Grilles & LouvresContact Supplier Request a quote. Steel Maximum Security Grille with Square Perforations. Blades are chevron in configreation and are mounted in a fixed position ina rigid PVC track in an integral part of the frame. Designed for door mounting. Available in either steel or aluminum construction with either single or double flange frame options. Amazon. P. Jet diffusers. Series FB. co. Excellent for installation in doors or partitions. Get Quote. ls in m = Throw distance to a bmaximum time averaged air vel ocity of 0. There is an HVAC register in the ceiling, so maybe it can pull the fresh air in through the ductwork? Or should I add a transfer grille in the drywall above the door to let air pass more freely?The air transfer grilles are connected, via a control panel, to a standard fire alarm system. Intumescent air transfer grilles allow movement of air when fitted into doors, walls and ductwork in a building. Login / Register; 0117 9372846;. When mounted into a door, our telescopic frame can facilitate a door thickness between 28 and 52mm, with light tight or vision proof cores to meet the application requirement. 005 150. Gilberts (Blackpool) limited is one of the largest UK manufacturers of Grilles, Diffusers, Louvres, Smoke/Fire Dampers and Natural Ventilation Systems for the Heating, Ventilating and Air Conditioning industry. 9 Slimline Weather Louvre AWLS 37 1. 42671 posts · Joined 2008. 47 L/s) for each 50 square feet (4. We can accommodate bespoke sizes or larger quantities – please get in touch with our team on 02920 857. Steel Maximum Security Grille with Square Perforations. Protect against rising threat of burglary. Door undercuts are often obstructed by carpets further reducing return pathways. Damper body formed in langed Z sections 52 x 35 x 196. £7. X. Maximum size is 36" x 36" (914 x 914). CERTIFICATIONS. Single Core with Flat Frame. 0 My Basket. Program. The TG Transfer Grilles by Hart & Cooley have an extruded aluminum contruction, have an inverted “Y”. TROX Services. TYPE GPS3 & GPP3 -Air transfer grille arrangement comprising of a high security bolt fixing unit on one side and a lower security clutch screw unit on the other. Domestic Warm Air Heating Grilles. Favorite. 1 800 222 5932. These are connected, via a control panel, to a standard fire alarm system. Such spaces include storage rooms and restrooms. 2. This will reduce moisture problems and help eliminate mold and mildew build up. Canadian iron main entrance doors gate grill design single door $35. Intumescent Air Transfer Grille. Use with 44mm Liner for FD30 doors & 54mm Liner for FD60 doors. 5 40mm 8mm Overall Size = List or Height + 57mm Overall Sizes = List + 67mm (+0/-1) 25mm Pitch 12. . Transfer Grilles offer the largest free area possible with the option of a sight-proof or light-proof core. Download Now. 3 Slimline Floor Grille ASGF 15 1. With high quality and competitive pricing these grilles form the back bone of a standard offering that will meet any application requirements. Gilberts Non-Vision Louvred Grille | Air Transfer Grille Cover. High – low transfer grilles. ) 5. Aluminum door return grille with sight-proof blades parallel to short dimension. Allowing air movement through a door or wall without compromising fire integrity. . 53. Grilles; Registers; Diffusers; Air Distribution; Fire Dampers; Access Doors; Air and Sound Controls; Louvers and Dampers. 3mm thick x 38mm wide strips which are pre-slotted to allow simple assembly into an Air Grille Matrix. Working from. In this case, their height will be determined by your system. Air transfer grilles are vents that are fitted into doors or walls to allow air to move freely around a building, helping it to stay ventilated. Air 360 Vent Cover Return Air Grille – 22 x 22 Inch Transfer Grille AC Vent Cover – Durable Rustproof Aluminum Design – Optimal Air Flow – Low Noise Wall Vent for Residential, Industrial Use. 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. ft. Download. 0006 0. 001 0. A door or partition non-vision grille incorporating inverted chevron blade…. Discreet, but attractive, this robust extruded aluminium grille incorporates a slotted, linear airway across its length and locates at the bottom of the door single doors, double doors and louvre screens. docx] Performance Data. see a portion of in picture posted. Transfer grilles are designed for use in doors and partitions to allow for smooth transfer of air between spaces. Download. Normally, when there is ducted returns, the filter is located at the air handler. We are the world's oldest manufacturer of decorative metal grilles. Pyrogrille air transfer grille allows free air flow and provides up to 60 minutes fire protection. Presto ! The grill vent covers require drilling a small hole in the alum for the screws. Secure the system into place using steel pins [not supplied]. All manufactured from 1. 304 Stainless Steel Construction (Optional 316 Stainless Steel) Z-Shaped Deflection Vanes Set on 1” Centers. Supply you have the fan to move air the returns are all low air pressure and do not work as well. Also, if the crawlspace access door is left open, it may not be discovered for some time. CERTIFICATIONS. Product 36 New Style Intumescent Block Grille. Introduction 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. They can be used for providing dampers in ductwork. James Gilbert & Son specialises in high quality decorative metalwork. 002 0. g. 005 150. Door controls. 1 800 222 5932. Alternatively, please contact TENMAT for details of suppliers of finished grilles complete with steel frame and steel faceplate louvres. 3. Height : 1005 mm. Lorient LVH44 – 300 x 300mm Intumescent Grille. The damper units are slimline with an overall thickness of only 35mm, allowing these kits to be flush fitted within the conventional 35mm & 45mm nominal fire door leaves. 006 0. Specifications - Gilberts (Blackpool) EN English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk Magyar Bahasa Indonesia. Bespoke designs, priority order and guaranteed delivery dates. 021 250. In line with the smaller Louvres this series offers a high resistance to weather ingress combined with a good 50% free and both flanged and recessed channel frame options can be selected along with standard bird guard and insect screen accessories. James Gilbert & Son specialises in high quality decorative metalwork. (Matt black inish). Manufactured using modern<br />. The negative pressure on that duct of your HVAC system will mess with the air distribution in weird (bad) ways, and it's almost certainly not big enough for what the dryer will be trying to pull. 603. Intumescent air transfer grilles allow movement of air when fitted into doors, walls and ductwork in a building. The grill will be larger than you think, at least 18" square. Lancashire FY4 4QT. Genuine Comfort find that air return grilles tend to be the better choice between transfer grilles and air return grilles. 5mm coldTransfer Grille Baffle. Suitable for use in doors, walls or partitions the dampers are fabricated from thin Our range includes circular cast louvres, which are ideal for bathroom extractor fans, penthouse/turret weather louvres for roof mounted ventilation, weather louvre cladding for easy assembly on-site. comDoor Grille TROX (South Africa) (Pty) Ltd. Welcome to dba Air Solutions Ltd. 7" x 3. METALAIRE is the flagship brand of Metal Industries Inc. to return. Duct diffusers. Wrapping up smoke and fire protection with our range of Fire Dampers, Smoke Dampers, Smoke/ Fire Dampers, Intumescent Air Transfer Grilles and Air Volume Control Dampers all. We are also able to custom fabricate products to suit your specific architectural requirements. Single Louver Grilles: Titus’ 300/350 Series supply grilles define the standard for the industry. The problem is that sound (and a small amount of light) pass freely through the vents negating all privacy of closing the door. To be used where air movement/flow via fan is stopped in the event of a fire. dimensions: 788 x 788 mm H • Fitting dimensions: 7 mm more than the grille dimensions. transfer grills over doors to bedroom/office. 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. DESCRIPTION: Construction: Frame and blades are 6063 extruded aluminum alloy with 200-R1 satin anodized finish. Door Transfer Grilles. A rater-measured pressure differential of ≥ -5 Pascals and ≤ +5 Pascals (0. With this new Series Gilberts provide a comprehensive range of stainless steel grilles and diffusers designed to suit the most demanding of projects. Grilles, Diffusers, External Louvres, Smoke Dampers, Fire Dampers, Volume Control Dampers. Catalog Pages . 2. <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. We can supply vents in a bespoke design to suit your requirements. 170 in stock for next day delivery. A. HVC Supplies also offers one of the. Learn More > Hushon UK Ltd. Heavy Duty Registers and Grilles. Their special features make them ideal for placing in doorways and interior walls. See the top reviewed local door contractors & installers in Victoria, BC. ago. Heavy duty registers and grilles work well in any application where the air volume is large and easy removal for cleaning is required. 004 0. 5 to 6m x 1m, and each RAL coated to 7047, provide discreet, passive ventilation to the rooftop plant. Designed for. We are always on hand to help advise on suitability. Company. Uniclass Code : Pr_70_65_04_03. London’s Decorative Metalwork and Metal Grille Specialist. 2 sq. Intumescent air transfer grilles serve the same purpose but also expand when exposed to heat from a fire, sealing the gap in a fire door or wall – meaning the fire rating of the compartment is maintained. Grille face made of aluminium with anodised finish 30 mm wide front border Countersunk holes Optional equipment and accessories Grille face in RAL CLASSIC colours Installation subframe Matching rear frame for door installation. With a dedicated design team working on both new. Air Ventilation Grilles, Fixed Blade & Adjustable Louvres, Ventilation Diffusers, Air Supply & Air Exhaust Valves, HVAC Grilles, Air Security Grilles, VAV & CAV Units, Radiant Panels and Trench Heating supplies from the industries leading manufacturer. We supply a range of Stainless Steel ventilation grilles, trickle vents, hit and miss vents. LOUVRES. A fire-rated version is also available. Our range of combined intumescent fire + smoke air transfer grilles can be used in all applications where cold smoke containment is required. Item number: 35013002. 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. These airflow volumes are then used to size and lay out the ducts. 450x92. The Advanced Air Model Series 51DG Door Transfer/Non-Vision Grilles are designed to meet the demand for top quality andcompetitive prices. Air transfer grilles for fire doors. NV2 Grille. Please note - A very. 001. : Bedrooms with a design supply airflow ≥ 150 CFM are specified with any combination of transfer grilles, jump ducts, dedicated return ducts, and/or undercut doors to achieve a Rater-measured pressure differential ≥ - 5 Pa and ≤ +5 Pa with respect to the main body of the dwelling unit when all air handlers are operating. DSR units will only provide acoustic isolation improvements over that of a clear aperture. Cover grille (not included) Duct SERIES FB Door, Wall & Partition Mounting Intumescent Air Transfer Grilles Gilberts FB Series provides a compact, ef椀cient range of intumescent seals designed to satisfy many types of air transfer application in of椀ces, shops, schools, hospitals and many other commercial projects. Series GP Security Grilles. 4. Lorient Intumescent Air Transfer Grilles are used to provide an answer to situations where ventilation is required in fire compartment walls or doors. Aluminum door return grille with sight-proof blades parallel to short dimension. Construction is from all aluminium extrusion with fixed full chevron blades. (Matt black finish). AG10 Bar Grille. heating and coolingTransfer Grille Size Calculator: Adjust the data in the blue boxes, press enter or click "Calculate" Door Undercut : Room CFM : Height : Width : Needed Transfer Grille Area: Jump Duct Diameter " by " 24. Description. Conditioned air supply sized to deliver at a rate equal to 1 cubic foot per minute (0. A door undercut is a space between the door and the floor below it that’s large enough to allow air transfer between rooms. If the grille is installed close to the fan, a damper may need to be closed to direct air farther from the fan. Ross MacGugan of Ernest Griffiths, explains: “Gilberts’ grilles and diffusers were the most suitable technically and aesthetically for the project. 81 + VAT. 6171Revision: Date: Units: Page: Model: ® OF Submittal: XG-DGDFSS Stainless Door Grilles Door. V-shaped Deflection Vanes Set on 1/2” Centers. openings", but undercut doors, and/or transfer grilles (if large enough) located near the floor could meet the requirment of this portion of the standard. Exterior Stainless Steel Safety Door Grill, For Home ₹ 900/ Square Feet. 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. Allowing air movement through a door or wall without compromising fire integrity.