Buying a window is a long-term investment. It is therefore important to choose the type of installation and for this the best reference is to rely on standards. The AEV makes it possible to measure the permeability, the tightness and the resistance of joinery in the face of bad weather.
AEV simply means "Air - Water - Wind". This standard makes it possible to determine the resistance of joinery to these three factors and to gradually note the performance of the window for each of them.
- The air
The permeability of a window to air is evaluated by following the letter A of the number 1 for the worst results to the number 4 for the best. More carpentry has an important note more insulation is efficient and can save energy.
- The water
The joinery is rated from 1A to 9A (very good) for outdoor nude installation according to their level of tightness in the presence of water, usually external weather such as rain. If the number is followed by the letter B, it means that the upper part of the window is protected by a roof projection and that we have only tested the lower part of the window. The performance must be particularly high in humid regions to avoid water infiltration and the damage it causes.
- The wind
There are two rating criteria including the resistance to pressure, expressed from 1 to 5, and the deformation of the window, noted from A to C, the latter letter representing the least deformable joinery.
how to make a choice?
We are not looking for the same performances according to the type of dwelling (old or contemporary), the geographical situation and the climate of the region.
As a first step, you have to define the area where the home is located. The needs will not be the same if one lives in the south-east of France, which undergoes a strong enough wind, and the Paris region for example where it rains often.
The second criterion, which has a major influence in the choice of an AEV standard, is the situation of the dwelling or house. Depending on the density of the houses, the windows will be more or less exposed to bad weather. France is divided into 5 geographical zones which are themselves divided into several parts:
• large, dense urban areas,
• small and medium-sized cities,
• coastal areas (seaside, lake...).
There are other criteria to consider, such as the height of the window above the floor, the height of the building and its exposure. In the window labels, we also find the Acotherm standard, which classifies the thermal and acoustic insulation capabilities of woodwork and guarantees their quality.