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F4 double windows, open inward and outward

F4 double windows, open inward and outward
F4 double windows, open inward and outward
double window F4
F4 double windows, open inward and outward
The advantages of opening inward and outward is mainly that there is a markedly larger glass surface available and that, because fittings can be seen from the outside, the unique look of double windows is accentuated. As such, it gives the whole house a very special character.

Heat protection:
The double windows’ heat protection ability derives from the insulation effect of the air that is trapped between the inner and outer glass layer and thereby blocks the heat transfer between the living area and the outside. For houses that are not lived in the whole year round, the version with two-sided 4mm float glass would surely be an effective and simple solution. If the living area is, however, heated continuously during the heating period, it is advisable to fit at least one layer with insulation glass as the insulation value of the whole double window is thereby markedly increased and only in that way can meet modern standards and requirements. Especially in times of rising heating costs this investment with pay off very soon. Depending on individual insulation requirement also both glass layers can be fitted with insulation glass, thereby further increasing the K-value of the entire building and possibly even meeting passive house standards. Another important aspect of insulation is the sealing between the double window’s sash and frame. In the case of using double 4mm float glass the sealing should always be applied on the interior side of the window. This will prevent warm air from flowing in between the two layers during heating periods, as this may cause condensation to appear and could damage the window or could fog up the outer glass. If insulation glass is used, the sealing should always be on the insulation glass layer. It is of course also possible to apply several layers of sealing, as this would be necessary to meet high insulation needs (e.g. passive house).

Noise protection:
Double windows are superior to all conventional types of window construction in terms of noise protection as they have two completely separated frame and glass layers. This markedly reduces the transfer of sound waves and even in the most basic version achieves better sound proofing results than other modern window constructions. By using insulation glass or laminated glass, as well as applying additional layers of sealing this effect can be further increase and nearly all levels of noise protection can be achieved.

Tilting function:
The invention of tilt-and-turn fittings has made airing rooms by continuously tilting windows increasingly popular, even though this type of airing is not to be recommended, especially during heating periods. It is, however, not true that double windows do not possess this tilt-and-turn ability. The use of classic tilt-and-turn fittings does necessitate the use of a stronger frame profile, which in turn also reduces the size of the glass surface. Alternatively there is also an option of meeting such requirement in the way that is most common in double windows; by having a window within the window. In this case one of the sashes is fitted with an additional window frame that can be tilted if necessary. It is also possible to use separate fanlights with tilt-and-turn function or with a synchronized sash-tilting mechanism.

Key data:
Solid wood double window, 4-leaf, solid pine, incl. windows frame up to 18cm, insulation glass – outer side, double seam, circumferential seal, hand-forged brackets and locking mechanism, rain drain, impregnated and glazed surface