Stairwell natural louvred ventilator

Stairwell is a low profile, roof or wall mounted louvred ventilator, designed to provide heat and smoke exhaust ventilation in protected stairwells within residential apartments, hotels, shops and offices. It is principally applied to protect means of escape for occupants and to create a safe means of access for firefighters. The ventilator can be installed vertically or horizontally in roof openings and can be used as a corridor ventilator.

It is suitable for installation at any angle from vertical to horizontal. It conforms to EN 12101-2 and is CE marked. It has an open area of at least 1.0m² in accordance with the requirements of Approved Document B to the Building Regulations and BS 5588.

Stairwell ventilators should be controlled by clearly visible manual switches at the top of the stairwell and close to the final exit from the stairwell. The optional break glass switch or fireman's override switch are recommended for this.

Product information

Features and benefits

Certified performance - Stairwell can be used for applications where BS 5588 Parts 1,5 & 6 apply. It opens in a failsafe manner on loss of power, and has been tested and is CE marked in compliance with EN 12101-2.

Many options - Polycarbonate and glass versions allow the entry of natural daylight. There is a wide range of louvre types, accessories and finishes.

High performance - Stairwell is aerodynamically efficient and has a high resistance to weather.

Easy to install - Stairwell is delivered fully assembled to site and may be installed at any angle from the horizontal to the vertical. It has a wide range of base profiles to suit all sheeting, curb or glazing applications.

Durable - Stairwell is manufactured from tough, corrosion resistant aluminium alloy, grade 3005 in accordance with EN 573-3, with stainless steel fixings. Louvres pivot on double nylon UV- resistant bearings.

Quality of manufacture - Stairwell is manufactured under the ISO 9001 quality standard. Each unit is given a functional test before despatch.

We are at your service

We provide a pre-order design service. We also offer complete project management, installation, wiring and commissioning, which means that we take complete responsibility to ensure that the product is in full working order within one package of works.

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



Clear opening natural louvred ventilator. Dual purpose, for highly efficient natural ventilation and smoke control. Tested to and in compliance with EN 12101-2. Made from tough, corrosion resistant aluminium alloy with stainless steel fixings.

Dimensions/ size range

Six width options from 426mm throat width to 2336mm throat width.

Thirteen length options available from 705mm to 3498mm throat length.

There are some restrictions on the maximum size of the ventilator if glass louvres are used. Colt can advise on this.

Louvre options

Depending on the application, louvres made from:

  • Single skin aluminium
  • Single skin wired glass
  • Single skin laminated glass
  • Single skin toughened glass
  • Insulated double skin aluminium
  • Twin wall clear polycarbonate
  • Twin wall opaque polycarbonate


  • No seals
  • Low-loss brush seals (for aluminium louvres)
  • Rubber seals (for glass or polycarbonate louvres)

These reduce air leakage when the ventilator is closed.

Colours/ finishes options

  • Mill finish
  • Polyester powder paint to a RAL colour, standard 75 mu

Fixing options

Suitable for fixing either onto a curb, into glazing, into curtain walling, or into roof sheeting.

Controls options

  • 24V DC electric
  • 230V AC electric

Other options/ accessories

  • Bird guard
  • Insect guard
  • Burglar guard




Performance of Stairwell varies with the size and options selected. Most tests have been conducted in accordance with EN 12101-2.


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

Aerodynamic coefficient (Cv) up to 0.68
Reliability RE 1000 (1,000 plus 10,000 cycles for use as a day to day ventilator)
Wind load up to WL 4,000 N/m²
Snow load up to SL 2,000 N/m²
Resistance to heat B 300
Low ambient temperature operation T(00) to T(-25)
Materials resistance to fire B or E (to EN 13501-1)
U value up to 3.2 W/m2/K*
Sound insulation up to 11.0 dB R'w
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