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Roto engineers are always finding new and different ways to do things. Here we take a look at how our specialists have provided special ventilation flaps for tall buildings using aluminium window hardware.

These projects were overseen by the Roto Object Business team, which works with architects, planning engineers, system suppliers and facade manufacturers, acting as a bridge between these clients and the hardware experts at Roto Aluvision. The Roto team provides a full range of services from prototype creation to help on site with installation.

Ventilation flaps

These specifications are an example of window hardware being used for a building element that isn’t actually a window. Ventilation flaps are a popular option on taller buildings to allow users the option of letting in outside air without the safety issues associated with opening windows. This is particularly important on high rise constructions that are subjected to high winds.

Typically, these ventilation flap elements have sash widths from 170 to 300 mm. 

Parallel opening version

One way to make ventilation flaps is to use parallel projecting scissor stays from the Roto PS Aintree range. These components allow a sash to be moved inwards with ventilation on all four sides. The handle operates locking points from the Roto AL system, which can be located on all sides of the sash, especially near the corners. 

This type of opening was used on the “Marienturm”, a skyscraper in the Frankfurt business district. A total of 1,675 ventilation flaps can be found on the building along with 4,200 windows using Roto AL hardware.

Side-hung configuration

Our engineers have also designed a ventilation flap system using a specially adapted version of AL Designo. In this configuration, the flaps open in a similar manner to a turn-only window. Here, the hinges also act as opening restrictors.

A version using short restrictor rods to limit the opening has also been made and used on a project.

Wind resistant

Ventilation flaps on taller buildings are exposed to strong wind pressures and therefore tight air sealing is often an essential requirement. Roto engineers have created a special corner drive which allows the linkage to be carried around to the hinge side and for locking points to be located in this area. 

As well as ensuring a tight weatherseal, this configuration also helps to prevent the sashes of the ventilation flaps from warping, something that can be an issue with these types of devices.

There are other possible uses for this technology on glazed windows: for example the making of very narrow sashes with RC2 level security. If you have been asked to supply a type of opening and don’t know whether it is possible or what hardware to use, get in touch with your Roto representative. They can make enquiries and give you a definitive answer.

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