Home > Companies > Colt International Ltd > Coltlite CLN glass louvred ventilator

For high acoustic and thermal performance. Non-thermally broken extruded aluminium outer frame, face frame width 40 mm. Framed louvres set into non-thermally broken frames. Double glazed louvres with 28 mm thick clear toughened, float or laminated glass. Externally tested to and in compliance with EN 12101-2 as a smoke ventilator and CE marked. Externally tested to EN 14351-1, guaranteeing its performance as a façade element. Manufactured under the ISO 9001 quality and ISO 14001 environmental management standards.

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Standard product features


Non-thermally broken, 47 mm deep.


Blade pitch:

  • 155–355 mm (depending on overall size of complete unit) with central pivot point.
  • Blade frame to be a maximum of 49 mm between glass surfaces.
  • Visible width of horizontal louvre frame 32 mm when looking from the outside.


Fixing can be to curtain walling using 20–30 mm non-thermally broken glazing frame adaptor, or to structural opening using either through frame or strap fixings.


  • Frame mounted and painted actuator (hidden behind side frame profile) positioned at top or bottom on either side of frame and with a typical operation time of 32 s.
  • Optional device to reduce 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 (pneumatic version only), or by responding to an external release signal.

Its performance varies with size and options selected (tests to BS EN 12101-2 and BS EN 14351-1):

  • Aerodynamic coefficient (Cv): Up to 0.56.
  • Reliability: Re 1000 (10,000 cycles).
  • Wind load: up to 2000 N/m².
  • Snow load: SL 0.
  • Resistance to heat: B 300.
  • Low ambient temperature operation: T(00) / T(-15).
  • Materials resistance to fire: E (to EN 13501-1).
  • U value: Up to 1.8 W/m²K.
  • Air permeability: Class 4 to EN 12207 – 1.06 m³/hr/m² or 0.21 m³/hr/m at 50 Pa.
  • Watertightness: Class 5A to EN 12208 – Watertight at static pressure of up to and including 200 Pa.
  • Sound insulation: 35 dB R’w.

NBS Specification

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This product is associated with the following NBS Create clause:
90-45-80/340 Natural smoke and heat exhaust ventilators

Product specification

An important note about specifying



Colt International Ltd


+44 (0)23 9245 1111

Product reference

Coltlite CLN glass louvred ventilator

Size (overall)

[ ______ ]


 - Type:
[28 mm float glass]
[28 mm laminated glass]
[28 mm toughened glass]
[28 mm insulated metal skin panel]
 - Louvre dimensions:
[ ______ ]

Colour/ Finish

[Polyester powder painted, RAL]
Insert requirements; standard 60 µm.
Standard 20 µm.


[24 V DC actuator]
[230 V AC actuator]
[Pneumatic cylinder]

Manufacturer details

Colt House,
Ridgeway Office Park,
Bedford Road,
Hampshire, GU32 3FQ
Tel +44 (0)23 9245 1111
Fax +44 (0)23 9245 4220
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