Smoke control systems are installed to ensure stairways and communal corridors remain relatively free from smoke and heat in the event of a fire within a building to enable occupants of the building to escape and the fire service to enter the building safely.

What is an Automatic Opening Vent (AOV)?

AOV is an abbreviation for 'automatic opening ventilators'. An AOV system is a control system which works to vent air or smoke. AOV systems are mainly used to control the ventilation of smoke in a fire.

Easivent offer a comprehensive range of AOV kits, designed for self installation by mechanical and electrical contractors.

Under the Construction Products Regulations (CPR) it is a legal requirement to use only certified products for smoke ventilation. For more information see SCS Group's Technical Bulletin here.

STAIRWELL AOVS

What is a stairwell AOV?

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;

  • 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.

 Find out more in our blog

Using a stairwell smoke ventilator (AOV) for summer ventilation

As well as smoke removal and fresh air replenishment, a stairwell smoke ventilator (AOV) can be used for summer ventilation.

Daily Ventilation
The AOV may be used to evacuate heat or to provide fresh air to a lobby smoke shaft system during the summer months.

Providing Daylight
The stairwell ventilator may also be used to provide daylight to an internal stairwell. This is done by selecting a product with either glass or plastic blades or a lid in the case of a hatch. 

Find out how in our blog

Using a stairwell smoke ventilator (AOV) for roof access

The stairwell ventilator may also be used as a roof access hatch. This will require the opening mechanism to be designed so it doesn't obstruct access through the hatch. The example below uses Easivent's folding arms to ensure access is not blocked.

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In addition, manual controls to facilitate the opening and closing both from inside and from the roof can be installed. For security reasons, however, it’s important to consider the type of control used on the roof as a simple switch could be used by anyone who gains access to the roof (including intruders).

Find out more in our blog

Advantages of hatch and louvred stairwell smoke vents (AOVs)

There are two main types of smoke ventilators, used at the head of a stairwell – they are louvred vents and hatch vents. Both types of vents are able to perform the expectations of an AOV, however each have individual benefits which will influence the selection process.

Find out about the benefits in our blog

What type of stairwell smoke ventilator can I use?

The most common product types of stairwell ventilators are illustrated in our blog post:

  • Louvred ventilator
  • Louvred ventilator with weatherproof ventilation 
  • Roof hatch
  • Actuated vertical window

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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.

Find out more in our blog post

AOV KITS

Easivent makes it Easi for you to self-install AOV kits and smoke control systems

To make life easier for you we have put together a range of AOV kits which provide a solution for just about any smoke ventilation requirement in a building.

The Easivent Smoke Vent range is designed to self install and meets the requirements of Approved Document B of the Building Regulations which requires smoke control within the common escape routes of certain buildings. Typically these will be high-rise residential or commercial premises.

Our kits are all designed to work out of the box without the need for specialist installation or commissioning services. All products are CE marked and conform to the relevant British and European standards. The kits contain ventilators or actuators, control panels, smoke detectors and switches.

Our full range of smoke control systems and AOV kits are available to buy on our website today.

 Read more in our blog

How to select the best AOV Kit for the job

To make selecting an AOV kit straightforward, we’ve produced this simple step-by-step guide to selecting the best AOV kit for your project.

Easivent’s AOV Kits contain the relevant ventilators, actuators, control panels, smoke detectors and switches designed to work without the need for specialist installation or commissioning services.

The AOV kits are all available off-the-shelf for self-installation by electrical contractors, and are all supported by the Easivent sales team prior to order.

Find out more about how to select the best AOV kit for the job

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.

The Easivent Smoke Vent product range is designed to meet the requirements of Approved Document B of the building regulations, which require smoke control within the common escape routes of certain building such as high-rise residential and commercial buildings.

Benefits

  • Product savings
  • Improve profit
  • Tried and tested configurations
  • Compliance
  • Reduce project time
  • Control of risk
  • Customisation

Find out about the benefits in our blog

Under the Construction Products Regulations (CPR) it is a legal requirement to use only certified products for smoke ventilation. For more information see SCS Group's Technical Bulletin here.