Xtralite and Vitral are now a part of VELUX Commercial, and we are delighted to welcome you to our new website. Here, you will find our complete portfolio of daylight solutions and services for industrial, commercial and public buildings.

Size Grid for Modular Skylights

Check out the size grid of pre-fabricated VELUX modular skylights, which are available as fixed, comfort and smoke venting skylight modules.

Fixed modules

Modular skylights - sizes overview for fixed modules

Comfort ventilation

Modular skylights - sizes overview for comfort ventilation

Smoke ventilation

Modular skylights - sizes overview for smoke ventilation

For size specific load capacity, please contact us.

If roller blinds are requested for smoke venting modules, please refer to local fire authorities for permission.

Symbol explanation

Color for standard size  Standard size

Color for special size  Special size, functional limitations may apply

🞰 Module height above 2400 mm is delivered with an extra strong glazing unit only.

 Δ No roller blinds available.

⭘ Only open system actuator available.

 ‡ Not available for Ridgelight.

φ Rollerblinds must be pre-mounted.

How to measure the modules 

Width and height of the modules are determined by the outer width (W) and height (H) dimensions of the frame (not the measurements of the cladding, flashing or brackets). 
Warning triangle

Comfort venting VELUX Modular Skylights meet the requirements of the harmonised standard EN 60335-2-103(2015). Therefore, comfort venting skylights can be installed within reach, i.e. at installation heights below 2.5 m above floor level (inside) and ground level (outside).

We recommend that you observe national regulations and consider if the planned specific use of the building requires additional safety measures that must be applied by the installer/user to prevent serious injury.

For more details and information on smoke venting Modular Skylights, please refer to Technical Handbook and the safety guides delivered with each product. If VELUX roller blinds are installed, please observe recommendations.


The blind cloth of VELUX roller blinds is pulled on two tension steel wires on pulley wheels, which are accessible when the roller blinds are installed in skylights within reach. Therefore, they can cause serious injury, if a person gets in contact with them during the electrical operation of the blind. VELUX roller blinds have a recommended minimum installation height of 2.5 m above floor level (inside) and ground level (outside). In case of installation below that level, safety measures must be applied by the installer/user to prevent serious injury. No instruction or measure can eliminate the inherent hazards resulting from installation heights below 2.5 m.