Advantages of hatch and louvred stairwell smoke vents (AOVs)

A stairwell smoke ventilator is an automatic opening ventilator (AOV) which provides at least 1.0m2 of free area when open. It usually serves one of two purposes;

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What actuator do I need for my window?

Stairwell ventilation can be achieved by automatically opening a window within the stairwell. As always this is subject to the minimum free area being achieved when calculated using the method in diagram C7 of Approved Document B.

It is recommended that bottom hinged outward opening windows are selected for efficient smoke evacuation, however this is not a requirement of ADB. Stairwell ventilators are more commonly used for replacing fresh air in a lobby extract system.

A variety of actuators are available for different window types depending on what the required free area is.

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What type of stairwell smoke ventilator can I use?

A stairwell smoke ventilator is an AOV which provides at least 1.0m2 of free area when open. It usually serves one of two purposes;

  • to evacuate any smoke that gets in the stairwell of small buildings,
  • or, more commonly, it provides replacement air for a lobby smoke extract system in large buildings.

The most common product types of stairwell ventilators are illustrated below.

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What our Approved Installers say about Easivent training

Easivent has now been running Approved Installer Training for over a year, with 7 training sessions completed and 15 companies becoming Easivent Approved Installers.

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Self-install AOV kits can benefit your bottom line

Take advantage of the AOV kit approach and gain many benefits for your smoke control project.

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Fantasy Football League Update

Our Fantasy Football League is now in full swing. With 24 Gameweeks played, we’re just over halfway through. Everyone’s interest in football has peaked, discussing strategic moves and team formations, rushing to make last minute substitutions before the deadlines.

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What is a stairwell AOV system?

Stairwell automatic opening ventilators (AOV) are used in the stairwells of flats and office buildings where protecting the common escape routes is of paramount importance. 

A stairwell smoke ventilator is an AOV which provides at least 1.0m2 of free area when open. It usually serves one of two purposes;

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Mechanical Smoke Shafts: 7 steps to successful selection for apartment buildings

Mechanical smoke shafts are the most common method of smoke control in high rise apartments. Although they are in essence very simple systems comprised of relatively few components, they are not yet included in the Building Regulations and tend to be shrouded in mystery, and thought of as a specialist package.

However, selection and installation of mechanical smoke shaft systems are well within the realm of competence of most mechanical or electrical contractors. We explore the steps that should be taken for successful selection in apartment buildings.

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