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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 fire fighters. 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.

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

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

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