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Frequently Asked Questions
Why restrict a window's opening?
Because of falls, particularly among young children.
Windows above ground level are a recognised hazard.
A child can climb to a window and pass through a small opening.
Restricting to a dimension they cannot pass is the standard mitigation.
In many markets it is a requirement rather than a precaution.
It commonly applies above a certain height where the sill is accessible.
How does that conflict with escape?
The same window may need to restrict daily and open fully in an emergency.
Those are directly opposing requirements.
Releasable restrictors exist for exactly that situation.
A catch, key or concealed release allows full opening.
Whether that satisfies both requirements is a regulatory question.
The answer differs between jurisdictions and is not settled by the product.
When is a fixed restrictor appropriate?
Where escape is not a consideration for that window and fall risk governs.
Fixed devices cannot be released.
That is both their advantage and their limitation.
They are simpler and cannot be defeated.
They also prevent cleaning the window from inside.
Which type is appropriate follows from the window's role rather than preference.
What about cleaning?
A restricted window cannot be cleaned from inside, which matters at height.
External access is expensive or impossible on upper storeys.
Releasable restrictors allow full opening for cleaning.
Easy-clean hinges address the same problem differently.
The release should not be operable by a child.
Balancing accessibility for adults against inaccessibility for children is the design problem.
How strong does a restrictor need to be?
Strong enough to resist a person's weight, not merely hold a window steady.
It is a safety device rather than a convenience.
Fixing into sound material with specified fasteners is part of it working.
A restrictor screwed into a weak section will pull out.
Products tested to a recognised standard state their performance.
For a genuine fall-prevention application, tested devices are what should be specified.
Can they be retrofitted?
Most can, and retrofitting is common.
Cable and arm restrictors fit to existing frames and sashes.
Fixing has to reach sound material rather than trim or beading.
On uPVC and aluminium the section behind matters considerably.
The achieved opening should be measured after fitting.
Confirming it against whatever dimension is required is part of the job.
Do they replace the stays?
Usually they work alongside them rather than replacing them.
The stay still carries and holds the sash.
The restrictor limits how far that movement goes.
Some stays incorporate restriction directly.
Those are simpler but less easily changed.
Where both are fitted, the stay's weight rating and the restrictor's strength both apply.