The Holding force is the force with which a window actuator keeps a closed sash shut – for example against wind suction on the façade or against someone trying to push the sash open from outside. It is given in newtons (N) .
Why does holding force matter?
- Tightness: the sash must sit firmly in the seal, otherwise there will be draughts
- Wind suction: on high-rise façades and roofs the wind pulls at the sash
- Burglary protection: a high holding force makes levering open more difficult
- Large sashes: long sashes are often held by two actuators or an additional locking actuator
Holding force and pulling force
The pulling force describes how strongly the actuator pulls the sash closed. The holding force applies to the closed state. Both values are in the actuator data sheet, if the manufacturer specifies them.
Frequently asked questions
Is the holding force of a chain actuator sufficient?
For normal tilt and top-hung windows usually yes. For very large sashes, high wind loads or increased burglary protection requirements, an additional locking actuator makes sense.
Where can I find the value?
In the actuator data sheet. If it is missing, ask us – we will check the data for your application.
Read more
- Glossary: Thrust force
- Glossary: Locking actuator
- Guide: Window actuators and burglary protection
- Guide: Snow and wind load
Not sure which actuator fits? Call us at 040 50694631 (Mon–Fri 8 am–5 pm) or use the actuator finder.
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Related terms: Chain actuator · thrust force · Locking drive
Datasheets and manuals · All terms in the glossary
