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Frequently Asked Questions
How does a casement operator work?
A crank turns a worm or spur gear that drives a linkage arm.
The arm pushes the sash outward and sideways together.
That follows the arc a side-hung window takes.
The geometry is calculated for that specific path.
It replaces a handle where one cannot be reached.
The crank is turned by hand at the window rather than remotely.
Can it be used on an awning window?
No - an awning operator pushes in a different direction entirely.
A casement swings about a vertical axis.
An awning is hinged at the top and pushes out and up.
Fitting the wrong type produces a mechanism that binds.
It also loads the sash and frame in unintended directions.
Ordering by window type rather than by appearance avoids it.
Why does the window stay where it is wound?
Because a worm drive cannot be back-driven.
Wind cannot push the sash open against the mechanism.
No separate catch or stay is needed.
The window holds at any position through the travel.
That self-holding property is a genuine advantage over a handle and stay.
Spur-geared operators may need a separate holding arrangement.
When is a different type better?
When the window is genuinely out of reach rather than just awkward.
A crank still has to be turned by hand at the window.
Chain winders suit high-level positions.
Pole-operated winders suit sashes well above reach.
Motorised actuators remove the manual operation entirely.
How far away the operator stands is what picks the type.
How far does it open?
Often a modest amount, which is the specification to check first.
That is fine for ventilation and inadequate for escape.
Where a stated free area is required, the opening has to be checked.
The mechanism itself can also obstruct the opening.
Published figures give the achievable opening.
Measuring against the requirement before ordering avoids an expensive change.
What sets the size needed?
Sash weight, including the glazing, and the opening required.
Glazed weight is what counts rather than the frame alone.
Double and triple glazing are considerably heavier.
Sash width affects the leverage on the arm.
Manufacturers publish maximum weight and width together.
Both limits have to be satisfied rather than just the weight.
Are the parts interchangeable?
Generally not - operator, arm and sash bracket come from one range.
Geometry differs between manufacturers.
Handing applies to most patterns.
Fixing positions vary and may not align with existing holes.
Identifying the existing system before ordering is worthwhile.
Where the range is discontinued, replacing the whole assembly may be the only route.