Linear Grilles

Linear grilles are a smart and simple solution which can be used in walls, ceilings and floors. Typically used as ventilation and air conditioning grilles, they're available in core materials including solid brass, aluminium or stainless steel. Their flowing horizontal lines give these vent grilles their linear name and they are available in a range of finishes including polished, patinated (e.g. antiqued, bronzed) or powder coated to any RAL colour.

Linear Grille - Image 1
Linear Grille - Image 2


We are happy to help and advise you through every step of the ordering process so please email if you would like assistance. The more information you can supply us with about the specification of your linear grilles, the sooner we will be able to supply you with your quotation.

NOTE: Non-regular, or trapezoid, grilles are also available.

1. Finish:

  • Polished Brass
  • Satin Brass
  • Antique Brass
  • Bronzed Brass
  • Stainless Steel
  • Bright Nickel
  • Satin Nickel
  • Powder Coated (please specify the RAL and gloss level; matt, satin or gloss)
  • Aluminium

2. Vane Size and Spacing:

  • 3mm Vanes with 10mm Spacing
  • 6mm Vanes with 6mm Spacing
  • 6mm Vanes with 10mm Spacing

3. Frame:

  • None
  • Integrated 19mm Angle
  • Removable 19mm Angle

4. Vane Angle:

  • None
  • 15 Degrees

5. Aperture (Opening) Dimensions with Unit of Measurement



The rectangular spaces between the flat metal bars give the linear grille a sleek, open appearance. When this type of air grille is used in ceilings and walls, the lighter version, which uses 3mm wide bars with 10mm spaces is generally used. This creates long thin 10mm spaced rectangular holes between the visible edge of the strips making them perfect for AC units. In these applications the grilles are most often pre-fitted with their own frames, which are then held in place with structural adhesive if it is unlikely that they will need to be removed, or screws / spring clips if removal is required. Screws are usually advised if they are to be fitted into a ceiling. Spring clips are especially suited to wall fittings over air conditioning and climate control ducts.


When linear grilles are prescribed to fit in floors they can be done so with or without frames, using gravity to hold them in place in the rebate provided by the trench heating unit. These vent grilles are generally produced using 6mm wide bars with 6mm spaces in between each bar, or vane. These heavier versions can also be fitted in walls and ceilings if their aesthetic appearance is preferred.


These air grilles are usually made with 3mm bars with 10mm spaces. They can be fitted either horizontally or vertically in a wall. The construction of the linear grille itself can be done in two ways; either with the long metal strips running lengthways along the greater dimension of the grille, or a greater number of shorter strips running width-ways across the shorter dimension of the grille.


All of these combinations are available in all of our special finishes. Brass linear air grilles are the most popular and brass forms the base material of many of the other finishes. If a more economic version is required then we can make aluminium linear grilles which can be supplied in their bare aluminium metal finish or powder coated any colour. Stainless steel grilles are a new addition to our air conditioning range.


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We guarantee that you will be more than happy with our decorative grilles and outstanding levels of customer service. If you have any queries, please get in touch.

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London’s Decorative Metalwork and Metal Grille Specialist

James Gilbert & Son specialises in high quality decorative metalwork. We are the world's oldest manufacturer of decorative metal grilles. 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 roots nor our smaller customers.

We use manufacturing, polishing and patinating techniques that we have honed to perfection for over a century, alongside contemporary engineering technologies.

At the centre of our business are decorative grilles including hand woven-wire and regency grilles, decorative screens and panels with associated frames and decorative metalwork. These grace some of the finest hospitality and entertainment venues, public buildings and private residences the length and breadth of the U.K. and beyond.

We have expanded our core range to produce products which befit modern living; offering a greater range of materials, designs and finishes than ever before. This range includes floor grilles, air conditioning grilles, air vents, radiator covers, decorative screens, frames, inlays, endings, cladding materials, security products, shelving systems, furniture, fittings and much more.

We are always using our knowledge and experience to bring innovative products and metal processing techniques to the market and our 2016 range includes a whole portfolio of new materials designed to contrast and compliment our metalwork. The location of our central London works makes us ideally located for supplying high quality decorative metalwork at short notice to satisfy the fast paced requirements of London’s design and construction industries.

We provide a fully comprehensive decorative metalwork manufacturing service. Our brass, bronze and steel products including radiator and floor grilles, furniture, fixtures and fittings are dispatched all over the world. We work with architects, interior designers, construction contractors and fit out companies, product designers and private clients on contemporary and historic projects where a high standard and attention to detail are required. We are more than happy to instruct and advise your on site contractors to ensure fitted products are applied correctly. With our extensive experience of processing and chemically treating metals, all our decorative metal grilles and associated decorative metal products can be treated to make the finish match the style and era of the project. We also colour match existing finishes if samples of original pieces are supplied. We have fully equipped metal working facilities with both historic and state-of-the-art machinery, which means our skilled craftsmen can truly fulfil your decorative interior and architectural metalwork requirements.

Whether your project involves the restoration of a single item – such as the supply of a single radiator grille - or the complete refurbishment of a modern department store or chain of historic hotels, please send us details of the project now including measurements, photographs, architectural drawings, CAD files, pdf’s, sketches on envelopes, pipe cleaner models, vague notions and loose concepts are all accepted as starting points. The best results are achieved when we are included in the early stages of a project from where we are happy to advise and be on hand to help all the way through to completion. Let us initiate the discussion as to how we can help you now, and we look forward to working with you!

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Our Customer Promise

We guarantee that you will be more than happy with our decorative grilles. If you have any queries, please get in touch.