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WindowMaster WML 825

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100N / 10kgthrust force
up to 570mmadjustable stroke
24Vvoltage
Greycolours
Sync option: Nosync

Why Choose the WindowMaster WML 825

Hidden When Closed

The actuator sits behind a permanent ventilation flap, keeping the window line clean. A practical choice where appearance matters as much as automation.

Made for VELUX Roof Windows

Designed around VELUX GGL, GGU and VL window sizes, with brackets and a drilling template included for a straightforward fit.

Robust Build

Zinc housing with a stainless steel chain, electronic disconnection to avoid overload, and a 3000N locking force for secure closure.

24V DC – Up to 570mm Stroke – 100N

Product code ACWM-WML-024V-0001. 2 Core + Earth wiring. Compatible with Ventec 100 Series controllers. Grey finish, bespoke colours on request.

Key Features

Concealed Mounting

Mounts behind a permanent ventilation flap, so the actuator is not visible when the window is closed. Clean sightlines with no surface-mounted hardware on show.

VELUX Compatibility

Suitable for VELUX GGL and GGU roof windows from size 206/F06 to 810/U10, and VL windows from size 035.

3000N Locking Force

High locking force holds the window firmly closed against wind load and weather once the chain retracts.

Complete Fitting Kit

Supplied with upper bracket connecting pack, left and right brackets, fitting and drilling template, safety plate, and installation guide.

Need Some Help?

We have a team of ventilation specialists on hand to help guide you towards selecting the right actuator for your project.

Call us: 01202 725 485

Email us: info@vent-trade.co.uk

Technical Specifications

Performance

  • Thrust Force: 100N / 10kg
  • Traction Force: Up to 225N / 22.5kg
  • Locking Force: 3000N
  • Stroke: Various positions up to 570mm
  • Speed: Approx. 10.5mm/s
  • Application: Natural ventilation only. Not for new smoke ventilation systems. Smoke ventilation use only as a like-for-like replacement on a previously certified installation.
  • Window Types: VELUX GGL and GGU (206/F06 to 810/U10), VL from size 035
  • Window Width: 590mm minimum, 1300mm maximum (use an actuator with two push points if wider)

Electrical

  • Voltage: 24V DC
  • Absorbed Current: 1.0 amps
  • Wiring: 2 Core + Earth
  • Cable Length (standard): 1.5m
  • Controller Compatibility: Ventec 100 Series

Physical

  • Housing: Zinc, with stainless steel chain
  • Dimensions: 520mm (W) x 30mm (H) x 87mm (D)
  • Weight: 1.4kg
  • Protection Class: IP32
  • Operating Temperature: -25°C to +75°C
  • Finish: Grey (bespoke colours on request)