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Coltlite natural louvred ventilator

Coltlite is a natural louvred ventilator suitable for natural day-to-day building ventilation, as well as smoke control. Most variants conform to both EN 12101-2 as smoke ventilators and EN 14351-1 as natural ventilators. All products are CE marked. It can provide inlet and extract ventilation as well as the entry of natural daylight for most kinds of industrial and commercial buildings. It achieves high acoustic, thermal and aerodynamic performance. It is suited for installation into the façade.

Coltlite CLST

Coltlite CLST natural louvred ventilator, with completely flat glazed appearance as seen from the outside, suitable for natural day to day ventilation.

Detailed Description

47mm wide thermally broken extruded aluminium outer frames, frame face width 40mm. 34mm overall width framed stepped-edge double-glazed louvres set into thermally broken frames which are only visible from the inside. For installation in the vertical only. Not tested or certified for smoke control ventilation.

Dimensions / size range

From 300mm to 1600mm in width, and from 250mm to 3000mm in height as one module.


Thermally broken, 47mm deep


Outside is toughened bevelled glass; inside is float, laminated or toughened glass. 34mm overall width.

Blade Pitch

200 - 350mm (depending on overall size of complete unit) with central pivot point.

Colours/ finishes options

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

Fixing options

  • Fixing to curtain walling using separate adaptor
  • Fixing to structural opening using either through frame or strap fixings.

Controls options

  • Lever
  • 230 volt AC actuator
  • 24 volt DC actuator

The positioning of the frame-mounted actuator (hidden behind side frame profile) depends on the type of actuator selected. It is installed on either side frame (on the left or right) and with a typical operation time of 20-60 seconds. With electric versions there is an optional device to reduce the speed and force of the closing louvres in order to reduce the risk of finger trapping.


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

  • Air permeability Awaiting testing
  • Water tightness Awaiting testing
  • Resistance to wind class B3
  • U value ≥ 1.8


Tested to EN 14351-1:2006

Please contact us for more information relating to the application, specification, installation and servicing of this product.

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