Plastic windows: Which variants are there?

Plastic windows can be made quite different. This affects both the frame shape and the design features and the special properties of the window. In this article you will find an overview of all common plastic window variants.

frame shapes

The frames of plastic windows can be designed differently. The individual frame shapes are coded with specific letters in order to be able to describe the respective frame shape quickly and universally.

Fixed element (F)

Fixed elements are windows that can not be opened. You have no casement. Fixed elements often occur in combination with other frame shapes and complement them.

Fixed element with wing (FF)

Fixed elements can also have wings so that they can be opened. Also in this way they can complement other window parts.

Turning window (D)

Turn windows can only be opened by turning, but not tilted

Tilting window (K)

Tilt windows, on the other hand, can only be tilted but not opened by turning.

Turn-tilt window (DK)

These windows can be opened by turning or tilting the sash.

Skylight (O)

It is located above a window and can have a fixed, rotatable or tiltable wing

Lower light (U)

An underlight is located below a window, and may have the same possible properties as the skylight.

Combination of frame shapes

The coding allows a precise description of the frame shape. For example, F-DK-D means that the window consists of three wings, the first of which is fixed, the middle rotatable and tiltable and the right only rotatable.

D-DK-OK would then mean that it is a double-leaf window. The left wing is only rotatable, the right is rotatable and tiltable, above the two wings is a skylight, which is tiltable.

Design features of windows

It is basically possible to distinguish between two-pane and three-pane glazing. In both versions, a so-called "warm edge" can be installed to increase the insulation effect.

In addition, a version as a special sunshade window is possible, or an execution as a laminated safety window (VSG). Special soundproof windows and, for special applications, also fire protection windows complete the range.

Each of these designs has its special design features and performs in their respective construction method special services.

Classification according to resistance classes

Plastic windows can also be classified according to their respective resistance class. The resistance classes according to DIN EN 1627 are based on the design features and the equipment of the frame. DIN EN 356 defines resistance classes for glazing.

Classification according to U-value

Windows with U values ​​between 0.9 and 1.1 W / (m²K) are considered "energy-saving windows". Windows with values ​​above 1.3 W / (m²K) are not permitted.

Below 0.8 W / (m²K), one usually speaks of passive house windows, although these U-value classes are often used even in low-energy houses.

Windows with U-values ​​below 0.6 W / (m²K) are special windows that are only used under special conditions. They are very expensive and currently the absolute limit of technically and physically feasible.

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