Outward Opening Windows | Double or Triple Glazed Timber Windows | Aluclad Windows | Energy Efficient Windows Viking21


Outward Opening Windows | Double or Triple Glazed Timber Windows | Aluclad Windows | Energy Efficient Windows Viking21

Our outward opening Double or Triple Glazed Viking21 Wood or Aluclad Window is the answer to today’s need for higher energy efficiency  combined with the simplicity of Nordic design.

The triple glazed unit of our Viking window comprises two Low E panes and one standard pane of glass with Argon gas filled cavities and is 48 mm thick overall. To achieve the lowest possible U values we use SGG Swisspacer spacer bars which provides the best warm edge solution. This window has a U Value of ? W/²K see chart below.

This window is available in fully reversible, side hung, side hung projecting, top hung projecting, fixed light & shaped frame styles. Optional Aluminium Cladding on the outside face of this window ensures durability and Espagnolette locking points around the casement keeps the window secure while closed

Our outward opening Double Glazed or Triple Glazed Viking21 Timber or Aluclad window provides Energy Efficiency at a Competitive Cost.


Viking21 Aluminium Clad Window:

Modern, enduring, energy efficient, sustainable.

Drawings (PDF)

Outward Opening Windows | Double or Triple Glazed Timber Windows | Aluclad Windows | Energy Efficient Windows Viking21
Viking21 Aluclad Window



Opening Types


Side hung


Our Side Hung Window is a window type with a traditional design. Also available as a double casement “French” window (without a mullion so leaving a completely clear opening), suitable for use as a fire escape evacuation opening.

Dimensions: Maximum Width 906mm – Height 2036mm

Minimum Width: 356mm




Our Top Guided Window can accommodate up to a 2 m² opening casement window. Sliding hinges hidden into the groove between frame and sash provide a modern appearance with increased security. Depending on the opening dimensions this type of window can be used as a fire escape. One of the  recommended uses of top guided windows is in places where it is possible to clean the window from the outside eg ground floor, balconies etc.

Maximum Width: 1600mm – Maximum Height: 1536 mm**

Minimum Width: 300mm


top swing


Our Top Swing Window can accommodate up to a 2 m² opening casement window and is a real light catcher for your home. Sliding hinges hidden in the groove between frame and sash provide a modern look with increased security. The sash can be reversed almost 180º for easy access and cleaning so  can be used on upper floors. Also suitable for Fire Escape egress depending on dimensions.

Maximum Width: 1600mm – Maximum Height: 1592mm**

Minimum Width: 300mm

** Not possible to get the max height and max width at the same time.


Fixed light



Multi light (with transoms and mullions



Our fixed lights and windows with mullions and transoms are a solution including a glass unit installed directly into the window frame, a good way to increase light gain to the inside of the building. Our product line also includes a wide variety of possibilities for structurally dividing frames with mullions and transoms. Single, multi-light window frames can be manufactured in sizes up to 2.5m x 3.2m

We also offer Windows for Angular and Circular Openings.


Teknos Aquatop and/or VRC

RAL; NCS and translucent systems:


Glazing Bar Options

COPY of SW11 aken 02 smallCOPY of SW11 puitaluaken 02 small


Technical Data of the Viking21 Window

Aluminium Cladding

Optional external alucladding


48 mm 3-glazing, two LowE glass, argon filled


26 mm 2-glazing, one LowE glass, argon filled

Frame Depth

116 mm (128,5 mm with alucladding)

Sound Insulation

Rw = 33 dB (-1;-4) – with standard glazing

Material of Sash and Frame

Glue-lam pine; quality class A1-A3

Number of sash gaskets

1 sash gasket

Color of sash gaskets


Thermal transmittance

Uw = 1,24 W/m²K (1,23 x 1,48 m opening standard window)


IPA hinges; Mila espagnolette; Fix handle


PAS24 solution option

Air tightness

Class 4 (600Pa)

Water tightness

Class E1500 (1500 Pa)

Resistance to wind load

Class 5C (2000 Pa)


Side hung:
Sash: W 356-906 mm x H 317-2036 mm

Side projecting:
Sash: W 320-1038 mm x H 317-1738 mm

Top hung:
Sash: W 300-1600 mm x H 322-1536 mm

Top swing:
Sash: W 300-1600 mm x H 504-1592 mm

Links to Further Reading Below:

Additional information

Opening type


Hinge type

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Glazing type

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Timber Type


U Value

Direct Line Timber Ltd. is a Limited Company Registered in Scotland and Trading for Over 25 Years

Company No: SC155945

VAT No: 693-8290-87

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