Louvre Window: Coltlite Louvred ventilator

The Coltlite window louvre is a natural louvred ventilator for installation into the façade for both day to day and smoke ventilation. It can provide an elegant means of providing ventilation.

Product Information


The Coltlite window louvre is a natural louvred ventilator for installation into the façade for both day to day and smoke ventilation. It can provide an elegant means of providing ventilation.

Its form and function makes it particularly suited to naturally ventilated buildings where good aerodynamic and measured free area ventilation is required while achieving high acoustic, thermal and aerodynamic performance. Whilst it is primarily designed as a glazed element of the building envelope, it can also be applied as a high specification fire, smoke and air control damper. Typical applications for the Coltlite window louvre are hospitals, schools, shopping centres, apartments and commercial buildings.

Features & Benefits

For a full specification, click here.

Wide range of applications – Most versions of Coltlite are classed as dual purpose ventilators, providing both day to day and smoke control ventilation. It can also be installed either for low level air inlet or for high level extract. Coltlite is also often used as a termination piece for large ducted or air handling systems. Glass versions allow the entry of natural daylight, and a wide range of infill panels are available. Options include pneumatic, electronic or manual controls and a wide range of louvre types, accessories and finishes.

High performance - Coltlite has high aerodynamic, acoustic and thermal performance, and has a high resistance to the effects of fire. See the leaflet for further details.

Certified performance – Most versions of Coltlite have been exhaustively tested and certified to EN 12101-2: 2003 as dual purpose ventilators in accredited third party test laboratories and are CE marked. The ventilator is CE marked according to EN 14351-1 which guarantees its performance as a window.

High performance in fire - One of the architect’s main design considerations is to make sure that any smoke emitted by a fire is evacuated from the building in a controlled fashion. Special arrangements need to be considered, in particular for escape routes such as in stairwells. Coltlites are very suitable for protecting escape routes since they have a high aerodynamic efficiency, open quickly, have large openings and do not get in the way of people trying to leave the building.

Easy to install - Coltlite is delivered fully assembled to site into a structural opening or curtain walling. It must be installed in the vertical. It has a wide range of base profiles to suit most sheeting, curb or glazing applications.

Durable – The frame is manufactured from tough, corrosion resistant aluminium alloy, with stainless steel fixings.

Quality of manufacture - Coltlite louvre windows are manufactured under the ISO 9000 quality standard. Each unit is given a functional test before despatch.

Aesthetic design – Coltlite uses narrow framework and motors can be hidden within the frame or are small in size.

Design service - Colt provides a pre-order design service. Please contact Colt for more information relating to the application, specification, installation or servicing of Coltlite.

CLN Specification


Coltlite CLN natural louvred ventilator, suitable for natural day to day ventilation and smoke control. Tested to and in compliance with EN 12101-2, and CE marked. For installation in the vertical only.

Detailed Description

Non-thermally broken extruded aluminium, frame width 40mm, outer frame with framed double glazed glass louvres into non-thermally broken frames.

Dimensions / size range

From 300mm to 2000mm in width, and from 250mm to 3000mm in height as one module.


Non-thermally broken, 47mm deep

Louvre infill / glazing

  • 28mm overall clear toughened, float or laminated double glass (4-20-4).
  • 28mm overall insulated metal skin panel infill.

Louvre dimensions

Louvre height from 150mm to 350mm.

Blade pitch 155 to 355mm (depending on overall size of complete unit) with central pivot point. Blade frame to be a maximum of 49mm between glass surfaces.

Visible width of horizontal louvre frame 32mm when looking from the outside.

Colours/ finishes options

  • Polyester powder paint to a RAL colour, standard 60 mu
  • Anodised, standard 20 mu

Fixing options

  • Fixing to curtain walling using 20 to 30mm non thermally broken glazing frame adaptor
  • Fixing to structural opening using either through frame or strap fixings.

Controls options

  • Lever
  • Crank handle
  • 230 volt AC motor
  • 24 volt DC motor
  • Pneumatic cylinder

Frame mounted motor (hidden behind side frame profile) positioned at:

  • Top
  • Bottom

on either side frame and with a typical operation time of 32 seconds.

  • Optional device to reduce the speed and force of closing louvres, to reduce the risk of finger squeezing (electric versions only).

If used as a smoke ventilator, activation is either by local thermal fuse which opens the unit at a pre-selected temperature, or by responding to an external release signal.


The following performance attributes follow tests to EN 12101-2:2003 (standard for smoke and heat exhaust ventilators) and EN 14351-1:2006 (standard for windows and doors). The exact performance attribute will depend on the chosen size, controls, and louvre type.

ReliabilityRE 1000 (10,000 cycles)
Wind load classVaries with size and options, up to WL 2000
Snow load classSL 0
High temperature classB 300
Low temperature classT(00) to T(-15)
Materials resistance to fireE (to EN 13501-1)
U valueup to 1.8 W/m²K
Aerodynamic coefficientUp to 0.56
Air permeabilityClass 4 to EN 12207 - 1.06m³/hm² or 0.21m³/hm at 50Pa
Water tightnessClass 5A to EN 12208 - Watertight at static pressure of up to and including 200Pa
Sound insulation (R'w)Up to 35dB


Tested to and in compliance with EN 12101-2 and CE marked.

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