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Window Controls Glossary

A glossary of some of the key terms you may come across on our website relating to window controls, devices and accessories.


Essentially a window opener. An actuator is a component responsible for creating physical movements or controlling a mechanism/system. Converting energy into linear or rotary motions to open and close windows.


An Automatic Opening Vent. Usually controlled by an actuator, these vents open to clear areas of smoke in the event of a fire. We provide a range of AOV roof vents and AOV Wall Vents.

Centre pivot window

A window where when open the sash pivots in the centre of the frame with half the sash in and half the sash out of the room. Often paired with sensors and an electric motor, this is a gravitational ventilation system used to expel excess smoke and heat during a fire.

Chain opener

A window opener designed for more domestic applications such as corridor windows. Powered by a chain these actuators are popular for their aesthetics however, lack the force to automate heavier windows such as rooflights.

Control unit

A circuitry component that is responsible for directing the operation of actuators to open vents/windows.


A damper is usually used in combination with smoke ventilation applications and reduces the effect of the smoke build up by releasing it slowly when closed or quickly when open.

Electric window openers

An opener that is operated remotely. Usually controlled by a sensor, button or pre-set configuration activating the motor to open a window.

Glazed louvre

A ventilator designed to allow smoke to escape, similar to a louvre, however with the difference glazed louvres contain glass panels to prevent water and weather from getting in.

Highline Manual Window Openers

Used in conjunction with manual window operators to open out of reach and inaccessible windows. Allowing the control of individual or multiple windows from a singular handle.

Linear Actuator

The opposite of the chain actuator. Linear actuators are usually larger components responsible for opening heavier windows as they are more powerful because they turn rotary motion into linear motion.


A ventilator designed to be used as part of a smoke ventilation system to provide a passageway for smoke to escape.

Manual window openers

Used in conjunction with highline window openers, often placed at low level and each to reach locations allowing the end-user to control windows that would be otherwise impossible to access.

Rack & pinion

A form of linear actuator for windows that require greater force to open the vent.

Screwjack opener

A system used for operating high-level windows. A winding pole is attached to the Screwjack Window Opener and wound to operate the window.


An electronic device that is designed to respond to a stimulus such as heat, light, motion or smoke.


A device used to control the connection in an electrical circuit system. Either provides connection or disconnects.


An automated device used to create a response at a designated time.


The process of removing pollutants from the air by allowing fresh, clean air into a room/area.