Chain drives

Chain drives for windows and skylights – selection and application

A chain drive is the most common solution for electrically opening tilt, turn, and roof windows. The chain pushes the sash in the opening direction and pulls it back against the frame when closing – compact and without large additional components. You will find the universal chain drive in our product range. VS-KA chain drive with 250 N to 1500 N thrust, the powerful VS-KA 2500 for heavy wings, the flat Built-in chain drive VS-CKA 300 for concealed mounting and the Double chain drive VS-DKA 800 for wide and heavy window sashes.

For larger opening angles, there are drives with a side-arc chain, for example the VS-SB 400/90 for 90° opening angle and the smart version VS-SB 400-i. Those who want to open windows without electricity use mechanical chain drives. VS-MKA and VS-MKA2 with a crank. The VS-KA-i It also offers synchronization functionality and bus integration.

All chain drives are CE certified and suitable for everyday ventilation as well as smoke and heat exhaust ventilation systems (SHEVS). You can determine the appropriate chain length using the chain length calculator on this page. We are happy to advise you on your selection – the drives are available from our Hamburg warehouse.

Choosing a chain drive: here's what matters

• Thrust: It depends on the sash weight, sash height, and opening direction. Roof windows and outward-opening sashes require more of a safety margin than vertical tilt sashes due to wind and snow loads.
• Stroke or chain length: The stroke determines how far the window opens. In the case of smoke and heat exhaust ventilation systems (SHEVS), it results from the required opening area specified by the specialist planner.
• Voltage: Smoke and heat exhaust ventilation (SHEV) systems typically use 24 V DC drives powered by a central SHEV control unit. For comfort ventilation only, 230 V versions are also common – the VS-KA, for example, is available in both variants. The voltage of each model can be found in the technical specifications.
• Wing width: Wide wings are opened with two synchronized drives or a double chain drive to prevent the wing from twisting.
• Installation situation: Check the available space on the frame and the profile. Suitable brackets are available for every installation situation.

Alignment and assembly of the chain drive

The chain drive is typically mounted centrally on the closing edge, i.e., opposite the hinge side of the sash. The chain must exit at a right angle to the sash to ensure smooth operation without lateral forces. The drive and sash bracket are precisely aligned before the end positions are checked. With two drives on one sash, a synchronous control ensures consistent operation.

Buy chain drives – for processors, metalworkers and specialist planners

Vent Systems supplies exclusively to business customers. All prices are net, excluding VAT. Delivery time is 3 business days within Germany and 5 business days within the EU. Are you unsure whether a chain drive, a Linear actuator or a Rack and pinion drive A better fit? Our guide Chain drive, linear drive or rack and pinion drive This article compares the three types of construction. It explains whether 24 V or 230 V is the correct voltage. Window actuator: 24 V or 230 V?

Frequently asked questions about chain drives

What is a chain drive suitable for?

For tilt, turn, drop and roof windows in daily ventilation and smoke and heat extraction. It is compact and therefore also fits narrow profiles.

How do I find the right chain length?

Use the chain length calculator on this page or send us the wing dimensions and desired opening width – we will recommend the right model for you.

Can I connect chain drives to a smoke and heat exhaust ventilation (SHEV) control panel?

Yes. The 24V chain drives are designed for operation on smoke and heat exhaust ventilation (SHEV) and ventilation control systems.

When do I need a 24V chain drive?

A 24V chain drive is the right choice if the window is also used for smoke and heat extraction (SHEV) or is to be operated via a central unit with battery backup power. VS-KA is available in 24 V with 250 to 1500 N, duty cycle 30 %.

When is a 230V chain drive useful?

For basic comfort ventilation without smoke and heat exhaust ventilation (SHEV) functionality. A 230 V chain drive is controlled directly via a ventilation switch and requires no power supply – ideal for retrofitting. The VS-KA is available with 250, 400, and 600 N in 230 V.

Which chain drive is suitable for roof windows?

On roof windows, the drive unit must overcome the weight of the sash as well as snow and wind loads – usually 400 to 1000 N are required. For very heavy sashes or humid environments, we recommend the VS-KA 2500 with IP66. More information in the guide. Chain actuator for roof windows.

Want to motorise an existing window? Find out which actuator fits in the guide Retrofitting electric window openers. If an old chain actuator from GEZE, D+H, Aumüller or WindowMaster is defective, you will find the right alternative in the guide Replacing window drives.