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.

Slit window actuator

Rising sash window

It is possible to automate a vertical sash window using linear actuators. The slit actuator from Simon RWA is a neat and unobtrusive solution to such applications.

 

Top hung outward opening window


Top hung outward opening window

Most often controlled by a chain actuator, or for larger windows, a folding arm is a reliable option.

 

 

Side hung window

 
Side hung window

Once again a chain drive would be suitable subject to being able to deliver the required free area. Otherwise a slit actuator or folding arm may be employed.

 

Bottom hung window
Bottom hung window

Most often controlled by a chain actuator, or for larger windows, a folding arm is a reliable option.

 

For more information on stairwell AOV systems, Easivent has written a pocket guide which you can download now!

Download your stairwell AOV pocket guide

 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.

Find out more about automatic opening vents on our information page here.

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