Home > Companies > Colt International Ltd > Meteor MLS Natural Twin Flap Ventilator

Natural twin flap roof ventilator, suitable for natural day to day ventilation and smoke control, for high aerodynamic, acoustic, airtightness and thermal performance. Tested to and in compliance with EN 12101-2 and CE marked. Manufactured under the ISO 9001 quality standard.

Features and benefits:

  • Wide range of applications - classed as a dual purpose ventilator, providing both day to day and smoke control ventilation. A polycarbonate version allows the entry of natural daylight, and an aluminium infill panel is available, with the option of additional acoustic attenuation.
  • Pneumatic or electric linear drives are available.
  • High performance - high aerodynamic, acoustic and thermal performance, and a high resistance to the effects of fire.
  • Acoustic performance – offers the option of a reduced noise panel with a performance of up to 33 dB R’w.
  • Thermal performance – As an option, the base of Meteor MLS can be thermally broken to reduce air leakage and increase insulation.
  • Proven performance - Meteor MLS has been exhaustively tested and certified to EN 12101-2: 2003 in accredited third party test laboratories and is CE marked.
  • Easy to install - may be installed into glazing, onto a curb or into sheeting. It has a wide range of base profiles to suit most glazing, sheeting or curb types.
  • Durable - manufactured from tough, corrosion resistant aluminium with stainless steel fixings.
  • Quality of manufacture - Meteor MLS is manufactured under the ISO 9000 quality standard.

Related literature

The following content references this product:

Standard product features


Meteor MLS is manufactured from tough, corrosion resistant aluminium with stainless steel fixings. The frames of both the base and flap can be insulated and thermally broken.


Varies with the size and options selected. Most tests to EN 12101-2.


RE 1000 (10,000 cycles).

Wind load:

Up to 1500 N/m².

Snow load:

Up to 5000 N/m².

Resistance to heat:

B 300.

Low ambient temperature operation:

T(00) to T(-15).

Materials resistance to fire:

E (to EN 13501-1).

U value:

Up to 1.07 W/m²K.

Sound insulation:

Up to 33 dB R’w.



  • Throat widths: 1000 mm to 2500 mm.
  • Throat lengths: 1000 mm to 2500 mm.

Flap glazing:

The following glass and polycarbonate options are available:


  • Laminated glass: 6 mm, 10 mm, 16 mm, 25 mm, 32 mm.
  • Toughened glass: 6 mm, 10 mm, 16 mm, 25 mm, 32 mm.


  • Twin wall: 10 mm clear and opaque
  • Triple wall: 16 mm clear and opaque.
  • 5-wall: 25 mm clear and opaque.


Electric failsafe open or close. Failsafe open versions are fitted with a back-up fusible link to open the vent at a pre-defined temperature, irrespective of the control mode.

Guards and accessories:

Various guards and accessories are available to suit particular applications.

NBS Specification

NBS Create logo
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

Meteor MLS natural twin flap ventilator


 - Throat width:
[ ______ ]
 - Throat length:
[ ______ ]


 - Frame:
[Single skin]
[Insulated double skin]
[Insulated double skin incorporating a thermal break]
 - Flaps:
[Single aluminium skin]
[Insulated double skin aluminium]
[Triple layer polycarbonate, clear]
[Triple layer polycarbonate, opaque]
[Triple layer polycarbonate, clear with thermal breaks]
[Triple layer polycarbonate, opaque with thermal breaks]
[Insulated double skin with reduced noise material]
To achieve R’w of 33 dB.

Aluminium finish

[Polyester powder coating]
Insert colour requirement.


[24V DC linear drive electric]

Manufacturer details

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