Colt International Ltd


Since the 1950’s, we at Colt International have pioneered the process of smoke control and have been a major patron in the research projects on the science behind smoke and fires.
You can rely on us at Colt to provide a unique smoke control system that protects the occupier of the building, all the while keeping the access and escape routes smoke-free. The system also helps to prevent flashover fire, which reduces the risk of the fire becoming out of control. Colt’s well-designed smoke control system protects the contents of the building, reducing the risk of harm to it by assisting fire-fighting procedures.

Fire Curtains

Colt’s fire curtains are used wherever it is necessary to create a provisional barrier in an event of a fire. It is used to seal off the area which is on fire, where it descends and prevents any smoke or fire from spreading from area to area. This allows people to access any protected escape routes without losing fire resistance.
The FM-1 fire curtain consists of a flexible fire-resistant fabric, wound around a discreet circular tube. Upon securing a signal from the fire alarm system, or on any loss of power, the curtain will automatically unroll to its functional position. Our FM-1 curtains have been extensively tested as fire barriers in accordance with EN 1634-1 standards, giving protection for a certain period of time and to a maximum proffered temperature.

Climate Control

Colt’s climate control networks are able to build optimum internal conditions by perfectly balancing all of the key aspects that determine the building’s overall climate. These are temperature, humidity, air movement, solar intensity, condensation and noise. 

Evaporative Cooling

Our evaporative cooling systems can provide an effective alternative to standard air conditioning, specifically with industrial and semi-industrial facilities which are not in need of constant internal temperature monitoring, and where these buildings are simply much too large for standard air conditioning to be cost efficient and economical.
This cooling system is regularly used in warehouses, shopping and leisure centres, and are highly popular with building owners and contractors as they have both low initial and running costs, as well as needing little maintenance.

Solar Shading

Whenever any of us are sitting inside a building, we can easily recognise and understand the benefits of the use of natural daylight being filtered in through outside. We respond and work better under controlled natural daylight than artificial light, and architects love to create premises that sparks admiration and captivates interest. There are a number of buildings with large areas of glazing that can be viewed almost anywhere, meaning that careful selection of the most apt solar shading is key.

There will be a reduction of cooling loads in summer months, with a reduction of heating requirements in winter – making it ideal all year around. There also could be potential for striking visual impact, with an additional potential to involve photovoltaic cells such as solar panels if needed.

Ventilation Louvre Panels

Louvre panel systems are popular with designers for many applications in industrial and commercial buildings. Their purpose can be to control light entry, to provide ventilation whilst maintaining rain defence, to provide screening, or a combination of these. Louvres can also be provided simply for aesthetic impact.

Features and benefits

  • Colt louvre systems have a distinctive sharp louvre profile
  • Colt louvre systems are both aerodynamically efficient and have a remarkably high resistance to weather
  • All Colt louvre panel systems have been tested to EN 13030:2001

Emirates Stadium, Arsenal - Case Study

The Colt impulse system consists of 59 Jetstream fans, four 1800mm extract fans, and all their associated carbon dioxide, smoke and heat detectors and controls. The fans are mounted under the ceiling around the car park, to move air and smoke towards each extraction point, avoiding the need for the extensive ductwork that would be required for a traditional system.

The benefits of the system include a more open environment, better CCTV coverage and lower initial and running costs.

A special feature of this project is that, with the reversible impulse fans linked to a wind direction sensor, the airflow is moved around the car park in either a clockwise or anti-clockwise direction depending on the wind direction. This allows for efficient smoke extraction.

Colt also provided a Universal Louvre screen (as shown above behind the "Arsenal" logo). These louvres both hide plant rooms and also are a decorative feature.

Eden Project, Cornwall Case Study

The Eden Project, a £57m showcase for global bio-diversity, is one of the most innovative and high profile Millennium Projects, and has quickly become one of the most popular visitor attractions in the United Kingdom.

Its biomes, which house plant species from around the world, are probably the largest plant enclosures in the world.

The Education Centre, known as The Core, is the latest addition to the site and provides an education facility designed to help communicate Eden's central message about the relationship of people and plants. The roof structure, with its spiky triangular-shaped skylights, recalls the opposing spirals found in many plants such as the seeds in a sunflower's head, pine cones and pineapples.

Colt provided Coltlite natural louvred ventilators around the inner atrium at the first floor level of the Core Building. These ventilators help to maintain acceptable temperature levels within the building.

Tate Britain, Gallery of British Art, London - Case Study

Colt were asked to provide a roof glazing system for both the new and the refurbished galleries to increase levels of natural light.

As part of the Centenary Development of the Tate Gallery in London, the north-west quarter of the Tate's Millbank site was redeveloped to provide six new exhibition galleries on the ground floor, four new galleries on the main gallery floor, and five refurbished galleries.

Colt provided a Braat roof glazing system for both the new and the refurbished galleries to increase levels of natural light. Colt also provided structural glazing for the roof of the new building, suspended from a roof-mounted steel construction, and solar shading through the installation of hollow section aluminium fins.

Alder Hey Children's Hospital, Liverpool - Case Study

The new Alder Hey Children's hospital was built to replace an old existing building located nearby. The new building has been constructed entirely within a park - the first of its kind in Europe. The design process included listening to the visions shared by children in large scale public consultations.

Striking features at the new hospital include an indoor tree-house containing a spiritual care centre, outdoor play decks featuring fish tanks on each of the six wards, a relaxation garden and interactive screens in patient waiting areas.

There are televisions and sofa-beds in each room so parents can stay over. Around 70% of patients at the new hospital are given private, en-suite rooms.

At the early design stage Colt was chosen to provide mechanical smoke ventilation, staircase smoke ventilation and louvre systems. The louvre design required specially shaped functional louvre panels for plant room ventilation and screening, which ideally suited Colt's Universal Louvre system.

Airbus North Factory, Flintshire - Case Study

The new £400m Airbus factory based in Broughton, Flintshire covers a massive 46,000 sq metres and will be dedicated to the production of carbon-fibre wings for Airbus's new A350.

Colt was asked to provide a system to the new single story factory which could provide a constant working temperature throughout the year. To manage this Colt provided and installed a multi zone system including inlet and extract ventilation. The system comprises over 100 different natural ventilators (Seefire, WCO and FCO) which were installed in both the roof and walls of the building. To regulate the internal temperature effectively these units are controlled to ten separate thermostats around the building which enable the system to automatically open and close the vents in order to maintain a steady temperature at working level.

The Treasury, London - Case Study

The Government Offices Great George Street - GOGGS as it is known in London, was originally designed and built between 1898 and 1917. It is an island site bounded by Parliament Street, Great George Steet, Horse Guards Road and King Charles Street.

GOGGS, which is a Grade II listed building, has been largely untouched since it was built. There is a very distinctive large circular court in the middle of the building, derived from an original Inigo Jones design for another building. All Treasury officials and Ministers are housed in the new open-plan accommodation which retains the building's facade.

Colt supplied and installed nearly 300 special Seefire ventilators around the various courtyard atriums which have been enclosed as part of the refurbishment works. The atriums have also been supplied with high specification internal security grilles, and Meteor type access doors which allow access to the roof for maintenance purposes.

The scheme is designed to provide smoke and day-to-day comfort ventilation to each of the atriums and utilises wind speed and directional feedback so that the correct configuration of ventilators in always operational. Internal temperature sensors allow for close monitoring of the atrium space temperature and automatically open and close ventilators according to the user set points.

Canary Wharf, London - Case Study

Born out of a vision in the boom years of the late eighties, Canary Wharf was London's most ambitious commercial development. It opened in recession-hit 1991 when the first tenants moved into the 50-storey tower, designed by US architect Cesar Pelli and completed by Olympia and York.

The tower at Canary Wharf is now an established London landmark with similar icon status as that of the Empire State Building in New York. This isn't the only similarity with the Empire State, which is now one of the world's most successful commercial developments.

The tower stands at 244 metres high and dominates London's eastern skyline. As the pinnacle of the tower the designers decided upon a 40 metre high stainless steel louvre pyramid which would be illuminated at night to provide London with a distinctive and unusual landmark. Colt was chosen as the company to design, manufacture and install the tower's pyramid.

Working closely with the project design team, Colt developed a stainless steel louvre profile which met the pyramid's aesthetic requirements and didn't deflect under design wind speeds of 75 mph. Once the design was finalised the process of manufacture began under exacting quality standards. The component parts had to fit together easily during installation and, most importantly, the exact lines of the pyramid had to be achieved. Made entirely from stainless steel weighing over 100 tons, the finished pyramid is 30 metres square at its base and 40 metres high. It is held together with over 100,000 nuts and bolts. Lights are fixed to the inside of the blades to illuminate the pyramid at night, and a louvre access door opens to allow a shining beacon to identify the building to passing aircraft.

Louvre panels are available in various configurations, materials, finishes and coatings to meet the requirements of almost any project. Besides aluminium profiles, there are all manner of glass, textile, wood, terracotta clay and translucent acrylic louvres available depending upon the aesthetic and energetic requirements.

Manchester United Football Club - Case Study

Old Trafford is an all-seater football stadium in the Trafford borough of Greater Manchester and the home of Premier League club Manchester United. With space for 75,957 spectators Old Trafford has the second-largest capacity of any English football stadium after Wembley Stadium, the third-largest of any stadium in the United Kingdom.

Colt supplied to Manchester United Football Club a large quantity of Colt ERD 75 louvre panels in the course of the building of the new quadrants in the stadium. These were facetted around the 30m curve of each quadrant. ERD is an extruded Single Bank Louvre System designed for applications requiring ventilation with a good degree of rain defence.

Piccadilly Station, Manchester - Case Study

The new station concourse at Piccadilly Railway Station in Manchester was completed in time for the Commonwealth Games in 2002. The brief was to give the station a 21st Century image, improve visibility and links with the city, improve circulation for passengers, and access for pedestrians and vehicles. Up to 50,000 passengers per day pass through the station.

Designed by BDP, with Laing O'Rourke as the Main Contractor, the redevelopment has won the British Council of Shopping Centres 'Special Award' for 2003, a Royal Institute of British Architects (RIBA) Award, a National Railway Heritage Modern Railways Award, amongst others. Colt provided louvre for screening and ventilation purposes to a variety of areas including plantroom areas. The louvres were a combination of single and double bank louvres, depending ion the specific airflow and rain defence requirements. Whilst the different types of product were mixed in banks of louvre, the external appearance of the louvres remains the same.


Building Services Maintenance

We offer mechanical and electrical, preventative and reactive service, maintenance and repair for a wide variety of building services equipment, whether or not this has been supplied by Colt. Our specialities are smoke control and fire protection systems, ventilation and general HVAC equipment and their associated controls and ancillaries.

What services we offer

Click here to view our building services maintenance leaflet.

"Service" means providing you with a tailored maintenance regime to ensure optimum product performance, whilst ensuring that legislative obligations are met. In the event of equipment malfunction, service means a fast and efficient call-out and repair process.

We offer a range of services which may be tailored to meet your exact building services maintenance requirements:

  • Programmed preventative maintenance. We will work to ensure that your equipment is in optimum running order. For customers with a maintenance contract an emergency helpdesk is available with an out of hours call out facility, which is manned 24 hours, 365 days a year. A test certificate will be issued for smoke control systems.
  • 24/7 emergency call-out.
  • Spare parts service.
  • Repair and refurbishment of existing systems regardless of who is the manufacturer.
  • Advice on regulatory compliance and certification for smoke control systems.
  • Environmental surveys to assist you to reduce your energy costs and carbon footprint.
  • Design support to optimize the performance of your installed equipment, should subsequent alterations to the building fabric or function be necessary.

In all cases both labour and parts are covered for 12 months unless otherwise agreed.

Design Support

Architects, builders, contractors, consultants and developers: you can count on Colt’s expert design advice should you need it.

We can develop tailor made systems integrating climate control, natural ventilation, solar shading and smoke ventilation. Our systems can help you unlock your building’s potential for energy efficiency, ensure fire safety and create architectural impact.

We can also carry out a detailed survey on an existing building to improve a system's effectiveness and performance.

Design advice and problem solving

Our experts have an in-depth knowledge of technologies and techniques across a wide spectrum. We have the experience to advise architects and consultants on the best combination of products and systems to achieve the desired effect and performance.

Simulations and calculations

To assist with designing effective design conditions, we use in-house computational fluid dynamics (CFD) and other design tools to simulate airflows and heat transfer within buildings. This knowledge enables us to design tailor-made concepts fully suited to every specific situation.

On solar shading projects, Colt experts can provide calculations of sun angles and heat loads to ensure the building's best performance.

Computational Fluid Dynamics

n order to assist with designing effective design conditions, we use in-house computational fluid dynamics (CFD) and other design tools to simulate airflows and heat transfer within buildings. CFD enables us to model how airflows and heat transfer will be affected by different design approaches. This knowledge enables us to design tailor-made concepts fully suited to every specific situation.

We have written some blogs on how CFD is used.

Some advantages of having these tools in-house


We have gathered a lot of experience in modelling a variety of different challenges in ventilation design in a wide variety of buildings and situations, for example:

  • Smoke clearance and fume extract in car parks
  • Smoke ventilation in commercial buildings
  • Overheating in power stations
  • Corridor overheating in residential buildings

Project Management

Once we are working with you on a project, we try extremely hard to ensure that the execution of the project will be stress-free. 

All our project managers, site managers and commissioning engineers have the qualifications, experience and technical knowledge to provide excellence in project execution. Our objectives in this area are five-fold, with each objective underpinned by the development of a number of capabilities:

  1. Safety – Our on-site activities can themselves either be relatively high risk or carried out within a relatively high risk environment.  All our on-site personnel have received comprehensive H&S training and awareness from our in-house H&S team, and we will ensure that H&S is always the highest level objective. Our project/site managers are Site Management Safety Training Scheme qualified and commissioning engineers are Site Supervisors Safety Training Scheme qualified.  Read about our H&S awards and accreditations.
  2. Quality – We will ensure that we provide the highest possible service throughout the delivery phase and that the equipment supplied will be fit for the purpose that was originally intended. We aim for excellence in procurement. We carry out regular quality checks and seek to obtain products which are quality assured, as are all the products that are made in our own factory. Download our quality assurance certificate.
  3. On time – All projects will be delivered within the parameters of an agreed programme that identifies deliverables in terms of both our own and the client’s key milestones.
  4. To the contract – We will ensure that we fully understand the contractual requirements at the earliest possible stage. Whilst avoiding “scope creep”, we will ensure that all deliverable requirements will be met.
  5. Within budget – At the pre-order stage we will advise the client correctly on all aspects of the service delivery, and also we will estimate accurately at that stage. Having secured the above four key objectives, we will also be able to deliver the project according to the client’s budget.

Factory Ventilation Survey

Research suggests that getting the right indoor climate improves productivity and reduces accidents and absenteeism improving the output and so profits of your business.

Colt's climate control experts focus on improving the indoor climate to make your staff more efficient and your process run more smoothly. Installing an efficient factory ventilation system will improve indoor air quality and comfort without excessive energy use.

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