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Transom

A transom refers to the horizontal bar separating a window or door and an upper glass panel or so-called 'fanlight' above it. The transom bar acts as a strengthening upper crosspiece and allows the fanlight and base window or door to open independently of one another.

Door or window bars and fanlights can also add impressively to design and exterior style. Notable examples include the UK Prime Minister’s Office, 10 Downing Street, where the door's thick white transom and decorative fanlight create a stark black and white colour contrast.

The benefits of a transom window or door

A door or window featuring a transom bar and upper fanlight is commonly referred to as a transom window or door. Beyond the support and design enhancements that this structure brings, further benefits of transom windows and doors include:

  • Supply of more natural light to the interior room
  • Good ventilation thanks to the tilt opening option
  • Excellent insulation and security due to quality glazing

Especially for doors with a closed panel that does not feature any glass, a transom structure and its fanlight can help to brighten dimly lit entrance areas and make hallways appear more spacious or welcoming while adding character to the building exterior and supplying air to interiors.

Material options for a transom window or door

At windows24.com, transom windows or an exterior door with a fanlight are available in a range of different materials, including uPVC, wood, aluminium, and aluminium clad variants.

Each material brings its own unique benefits, and the final choice will come down to customer needs and preferences.

Where modern uPVC transom windows afford low maintenance and ensure excellent energy efficiency due to their sleek surfaces and internal chambers, wood windows provide particularly attractive patterns and a warm texture that contribute beautifully to interior style.

Other transom window options, featuring aluminium, then provide enhanced security, weather-resistance, and impressive durability.

The entire window or door frame can be made from the metal, but we also offer exterior aluminium cladding expertly attached to a uPVC or wood base. Such cladding options have fanlight windows offer the benefits of both materials.

Different profiles and depths

For each available transom window or door material, different models or profiles are available. These differ based on their internal structures. Some windows contain a larger number of seals or chambers, for example, and therefore boast enhanced thermal insulation, whereas others are more standard but come with a lower price tag.

The different profiles also have varying frame depths and can be made to measure. This ensures customers can find the right product to easily install and fit structural wall requirements. The thickness and material of the transom bar will match that of the frame to ensure a harmonious and professional finish.

Transom manufacturing and dimensions

At windows24.com, all our windows and doors are manufactured in Europe according to strict regulations.

We work with several renowned suppliers and quality is integral from the first fitting to the final finish.

The transom bars are created as profiles themselves and are bonded onto frames of different shapes in expert processes to be delivered as a single door or window final product that customers can easily install into the opening of exterior walls by following our user-friendly assembly guides.

Doors or windows with overhead glass panels are available in a variety of customisable sizes. In the configurator, maximum and minimum height and width ranges for windows and doors are clearly displayed.

There are then interactive boxes for customers to add their dimensions after referring to our measuring guide and checking wall requirements. Exactly how the total height will be split between the window or door and its transom section can also be specified in the configurator's boxes.

Customisable transom features

At windows24.com we specialise in bespoke products that are tailored to customer requirements and transom windows and doors are no exception.

In terms of glazing, for example, a range of options are available from clear glass, which lets in a maximum amount of light to the interior room, to frosted and decorative glass variants that add style while enhancing privacy.

Whatever glazing is selected for the base window or door will also be used for the fanlight.

Regardless of the chosen glazing, customers can then also choose whether the fanlight panel above the transom should open or not.

A fixed option is available, for example, which can be ideal for a lower price tag or maximum break-in protection, but a tilt system may also be preferred by others. The tilt option means fanlights can be opened ajar and effectively air rooms.

A variety of different transom window styles can also be created thanks to our quality finishes.

As with any other window from windows24.com, the frames of transom windows can be customised with a RAL colour of choice or an authentic decor and the transom bar itself will then be finished to match. Glazing bars for fanlights and windows are then also available.

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