May 22, 2024
Written by Rebecca Clayton
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How large can a descending window be?
Descending windows are available in SF90 and SFXL systems, with SF Special providing further bespoke options. Achievable dimensions depend on the selected system and the requirements of the project.
The SF90 can be up to 18m2 per unit with a maximum carriage weight of 1500kg. This maximum size must be considered alongside the maximum dimensions of 6m wide and up to 6m tall.
The SFXL system can be much larger. It has been fully tested up to 6m tall x 12m wide per unit offering a maximum area of 40m2 with a maximum weight of 3500 kg. However, this system is able to be designed into impressive and bespoke installations where required. The largest descender front to date is 20m wide and weighs 7500 kg!
| SF 90 | SF XL | SF Special | |
|---|---|---|---|
| Max. Height | 6 m | 6 m | Unlimited |
| Max. Width | 6 m | 12 m | Unlimited |
| Max. Area | 18 m2 | 40 m2 | Unlimited |
| Max. Weight | 1,500 kg | 3,500 kg | Unlimited |
How are the descending windows operated? Do you use automation?
The sinking façade system is electrically operated and can be controlled using a variety of methods to suit the technology of your building including a fully automated glazing system.
A deadman’s switch is the simplest control solution and is included with the system as standard. The switch is normally fixed to a wall and has to be installed within viewing distance of the descending front. The user has to visually monitor the opening as it opens and closes to ensure that there are no obstructions to its movement. If you take your finger off the switch the Swiss Descending Window will immediately stop moving.
A more advanced control solution can be created with the introduction of sensors and photocells within the automated opening. The sensors and additional safety equipment monitor the opening during lifting and descending to make sure that it is unobstructed allowing simple activation of the facades movement with a single push of a button. The control equipment can then be integrated into a larger smart home technology system typically operated via smart apps or voice control.
When the sinking windows are open, what will the threshold look like?
The threshold detail depends on the selected system and surrounding floor finishes. Bespoke finishes, including timber, stone and metal, can be discussed with our technical team as part of the project design.
Threshold of the descending windows SF XL
Threshold of the descending windows SF 90
How much space is needed below the floor?
When the windows sink below the floor, they need somewhere to go. This area is known as the ‘parking space’. It is here that the glass elevation is housed when the doorway is open and where the motors, counterweights, the drive shaft, the compressor and the pneumatics are housed.
For the SF90 version this ‘parking space’ has to be the height of the window (H) plus 525mm with a minimum height of 2500mm. When using the SFXL version of the sinking façade this ‘parking space’ must be the height of the window (H) plus 1660mm.
How much space is needed for the descending windows?
When the elevation is closed, the Descending Window offers unparalleled water and air tightness, thanks to its four-part pneumatic seal. The inner seal is a cleverly designed system of press and labyrinth seals. When operated via a control pulse they expand, completely sealing the opening. Additional brush seals remove any deposit build-up in the framing and offer a neat connection detail between the frame and sliding leaf.
A drain or pump must be installed within the ‘parking space’ to deal with the small amount of water collected in the provided groove of the descender front.
Yes. Even windows.
By combining a 'traditional' window or door system into the sinking facade, you can create an elevation that offers the best of all options. Use these normal windows and doors on a day to day basis, but then open the entire facade when desired.
Solid doors (as well as facade systems) can be integrated into the sinking elevation to maintain design continuity throughout all areas of the building.
Incorporating doors and windows into the descending frame profile
How tall can the descending glass wall be?
The achievable height depends on the selected system, overall dimensions and glazing weight. Please contact our technical team to confirm the appropriate system and assess any bespoke requirements.
What glass options are there within the sinking wall?
We can integrate an unlimited number of glass designs into the Swiss Descending Window. These specialist glasses include coloured glass, frosted glass, double and triple glazing as well as highly technical electrical glasses like heated glass, privacy glass and electrochromic glass.
Is it possible to design a glass wall that sinks down halfway serving as a balustrade for upper storey rooms?
For upper-storey installations, the descending window and balustrade arrangement need to be considered together. Whether the moving pane can provide the barrier, or a separate balustrade is needed, must be confirmed for the particular project. Please contact our technical team to discuss the proposed design.
How much does a Descending Window cost?
Descending windows are bespoke installations, with costs assessed against the selected system and the requirements of each project.
For a project-specific quotation, please contact our technical team on 01494 722 880 or email [email protected] with your drawings, dimensions and project details.
