The "climate classes" always cause confusion. With the "climate classes", it is generally known that doors may warp by a maximum of 4 mm (this is a generally recognised rule) - it is also known that there are different climates. These climate classes are defined for interior doors by the RAL Quality Association for Interior Doors. They are based on European testing and classification standards.
The table below shows the relationship between the "climate classes" and the classifications according to European standards.
Individual companies classify neither according to RAL nor according to the European standards with e.g. "Company XY climate class III". In general, this classification corresponds to that of the RAL Quality Association - if necessary, enquiries should be made.
Occasionally, companies also specify a "climate class IV". Here it is necessary to clarify which climates or key data are used as a basis. This classification is usually used in conjunction with external doors. Climate c, d and e are usually tested for outdoor areas. Climate "d" means: -15°C, climate "e" simulates the heat effect of the sun.
We have summarised the facts in the table.