Window Actuator FAQs

An LM (Linear Motor) window actuator is an electrically operated mechanism used to open and close aluminium windows automatically.

It is commonly installed on top-hung windows, bottom-hung windows, rooflights, and windows that are on a higher level or hard to reach.

The actuator contains a linear motor that extends and retracts a rod or chain, allowing it to both pull the window open and close.

It is typically operated via a wall switch, remote control, building management system (BMS) and/or rain/wind sensors.

LM actuators are ideal for windows out of reach, or in commercial/industrial buildings like offices and schools.

They are used when controlled ventilation is required or if the building requires automated airflow

In most cases, no. Once fitted with an actuator, the window is designed for electric operation only. Some systems may include a manual override, depending on the specification.

LM actuators are a convenient choice for inaccessible windows where manual openings are not possible.

They allow for controlled ventilation that can be automated with sensors.

It can reduce the need for ladders or any access equipment that may be required to operate a window.

They can also be connected to smart home systems for the modern home.

Yes, LM actuators are commonly paired with aluminium systems, but the window size and weight must be within actuator limits.

You must ensure that the frame strength and fixing points are suitable, and the opening time must be compatible.

Chain Actuators are most commonly specified for standard windows. They are suitable for lighter weights and offer a compact and discreet solution.

Rod (Linear) Actuators are used for heavier or larger windows, offering a more robust solution for commercial applications.

The size and weight of your windows should be considered to specify the most suitable actuator for the demands of your project.

What is the required opening distance of the window? What are the ventilation requirements of your space? What power supply is possible for your window, typically 24V or 230V?

How do you plan to control them? Be that manually or through a remote or automated system.

Detailed coordination of these key factors is important to avoid retrofit issues.

Yes, but with limitations. You must have suitable fixing points, a frame and sash that can support the load and a suitable power supply that is accessible.

Be aware that, because of this, retrofit is naturally more complex than a factory-installed specification

Actuators will only require minimal ongoing maintenance. It is recommended to periodically test them, checking fixings and alignment for a smooth operation.

Specifying the incorrect size can lead to the actuator struggling or failing.

Poor alignment of the actuator can lead to uneven opening and closing.

Yes, actuators are typically rated for internal or external use and designed to operate in typical UK weather conditions.

A standard actuator will not work during a power cut unless a backup has been installed.

AOV systems often include a battery backup where emergency openings are required.

For a compact, standard window, a Chain Actuator would be suitable.

If you have a larger or heavier sash, a linear/rod actuator would be recommended.

Actuators typically come with a wealth of safety features, including an integrated overload protection, obstacle detection and manual override option where specified.

A window actuator must be securely fixed into reinforced sections of the aluminium frame, aligned correctly with the sash opening geometry, and supported by an adequate power supply. It is important to coordinate with the window manufacturer to ensure full compatibility.

Yes. Typical options include:
• 24V DC (most common for safety and AOV systems)
• 230V AC (standard mains supply)

Depending on the design, yes, they will be visible. However, they are generally compact and discreet. Most commonly mounted internally, they offer a neat finish, which can also be colour-matched for a consistent look.

Opening distance depends on the actuator. It is typically between 100mm and 600mm stroke. This is determined by ventilation or access requirements.

Actuators produce a small operational noise when opening and closing, which is normal for motorised systems.

Window actuators are not suitable for all window types and must be correctly sized to handle the required load. They also require coordination at the design stage to ensure proper integration, and retrofit installations may be limited or restricted.