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DK88-w150pxFor one off houses with high energy efficiency requirements Viking Windows have developed an inward opening 88 mm window with a thermal transmittance U Value Uw = 0,74 W/m²K [1].


Glazing units and hardware:

Viking Windows DK88 Low Energy Windows are equipped with the Argon filled insulated glazing units with two low-E glasses (Planitherm One) and SGG Swisspacer Ultimate warm edge solution; Ug = 0,47 W/m²K [2]. They have ROTO hardware and Hoppe handles and optionally one can choose versions with hidden hinges [3].

The opening and closing functions can be described with DK13 window animation below:


Viking DK88 Timber windows:

Energy effiecient, convenient, enduring, sustainable.

Drawings (PDF)

Drawings (DWG)



Viking DK88 Aluminium Clad Windows:

Energy effiecient, modern, convenient, enduring, sustainable, low maintenance.

Drawings (PDF)

Drawings (DWG)



Download the product flyer (PDF 0.6 MB) 


Opening types:


Tilt and turn windows:

This Window opens inwards in two ways - traditional side hung (turn) and the ventilation opening position (tilting from the top of the sash). There is also a micro ventilation possibility. In addition a ventilation restrictor device can be added to the hardware to enable it to fix the position after tilting sash. The Maximum weight of the sash is 100 kg. Available also as double sash french window (without mullion).



Side hung windows:

The Window opens inwards to one side (turn). Maximum weight of the sash is 100 kg. Available also as double sash french window (without mullion).



DK10-kald-smallTilt windows:

The window tilts inwards from the top, but only a little, to allow ventilation. Maximum weight of sash is 100 kg.




Fixed lights and windows with mullions and transoms:

Fixed lights are a simple solution which includes a glazing unit installed directly to the window frame. This is a way to increase light gain inside. A more complex variation could be a window with a fixed casement. This can be used in historic buildings where it is required to maintain the outside face.

Viking Windows product lines also include a wide variety of dividing possibilities for frames and casements: mullions, transoms, glazing bars and applied bars on glazing units. A single multilight window frame can be as big as 2,5 x 3,2 m.

COPY-of-DK13 aken 03-small COPY-of-DK13 puitaluaken 03-small
DK88 glazing bar solutions DK88 aluclad glazing bar solutions


For detailed information, please contact our sales department!


[1] 3-glazing with two Planitherm ONE Low-E glass; and with Swisspacer Ultimate spacer bars;

[2] 3-glazing with two Planitherm ONE Low-E glass;

[3] For detailed information, please contact our sales department!