VELUX Duo Vertical Extension Combi Solution

Enjoy floor-to-ceiling views and even more daylight with VELUX Duo Vertical Extension.

The VELUX Duo Vertical Extension features a roof window with a vertical extension window installed directly below it. The addition of a vertical window boosts the feeling of space and provides an extended view to the outdoors. The increased window surface also lets in more natural daylight to brighten your home in new, exciting ways. The solution can also be configured as a Quattro, with two rows of Duo Vertical Extension combi solutions connected together.

Benefits at a glance

  • Provides extended views to the outdoors
  • Installation is beautifully integrated into the roof
  • Allows more daylight into the room and makes it feel more spacious
  • Comes ready for easy installation of VELUX sun protection products
  • Can be combined with VELUX roller shutters for added heat protection

VELUX VIU - fixed vertical window element

  • Fixed vertical element (does not open)
  • It is an extension of the window above, providing more daylight and extended view to the outside
  • Material: maintenance-free, long-lasting polyurethane surface

VELUX VFE - vertical window element 

  • Inwards tilting sash to let in more fresh air
  • It is an extension of the window above, providing more daylight and extended view to the outside
  • Material: available in lacquered or white-painted pine wood.

VELUX VFA/VFB - tilt and turn, left or right hinged

  • Available in two models: left-opening (VFA) and right-opening (VFB)
  • Inwards tilting sash to let in more fresh air
  • Integrated opening restrictor in order to prevent accidents with unattended children.
  • Fulfils the legal requirements to be used as an emergency exit. 
  • It is an extension of the window above, providing more daylight and extended view to the outside.

Product Details

Click on the desired topic on the right to see detailed information.

  • Package contents

    The VELUX Duo Vertical Extension Combi Solution comes complete with everything your craftsman needs to create a perfect installation. The package includes:

    1 High-quality VELUX roof window 
    1 High-quality VELUX vertical extension window 
    1 Auxiliary rafter 
    Insulation and connection set for the windows 

  • Size and price

     All prices shown in the overview are MSRP without installation and are rounded to the nearest full Euro. For further information please contact your local VELUX sales office or installer. These certified craftsmen are also your contact for on-site consultation. 

  • Frame materials

    3 materials to choose from

    Choose between windows in high-quality plastic or wood. VELUX windows in wood are available either in white or in a clear varnished finish.

  • Accessories

    Shutters and Sun-screening products

    VELUX has a full selection of roller shutters, heat protection awnings, pleated blinds, insect screens and blackout blinds that are designed specifically for your new roof windows. Choose the VELUX sun protection that meets your exact needs from our comprehensive product range. The products can be easily installed using VELUX’s innovative and easy-to-use Pick & Click!® system.

  • Roof Pitch Information

    The VELUX Duo Vertical Extension Combi Solution can be installed in roof pitch ranges from 15° to 55°.

    For roof pitch ranges from 55° to 75°, please refer to our separate instructions (PDF).

Visste du at…?

Vi puster inn 22.000 ganger om dagen – og for det meste dårlig luft…1)

1) American Lung Association:

Visste du at…?

Vi tilbringer 90% av tiden vår innendørs – bor, jobber, lærer og leker… 1)

1) NEST-Project, Technical Univeristy Berlin, European comission 2004

Visste du at…?

Læringskapasiteten til barn øker med opptil 15% i godt inneklima… 1)

1) "Indoor Environment and learning in Schools", International Centre for Indoor environment and Energy (ICIEE), Technical Univeristy Denmark, 2013.

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