Climate classes of doors – Where warm and cold meet
What does the term “climate class” mean? The different climate classes describe the durability of the interior doors and apartment entrance doors, also known as the warping rigidity. Attention must be paid to this if the climate on both sides of the interior door is different. Built-in climate classes aim to prevent or reduce the warping of the interior door.
Discover apartment entrance doors here!
Important: A climate class does not stand for thermal insulation!
Definition of climate classes
Various rules and standards are used for high-quality interior doors. The RAL Quality Assurance Association (Rule RAL-GZ 426) should be mentioned in particular for the warp resistance of an interior door. These form the basis of the door classification. A third independent institute tests every door element with this classification. A newly created sort has been expanded to include two climate classes important for external doors and recorded in the International DIN EN 1121. The relevant climate classes for interior doors were adopted from the RAL definition.
Climate classes according to RAL and EN
The following climate classes were defined by the RAL International Institute for Quality Assurance and Labeling, adopted in DIN EN 1121.
Climate Class | Climatic conditions | Climatic conditions | ||
Temperature (air) | Relative Humidity | Temperature (air) | Relative Humidity | |
I | 23°C (± 2°C) | 30% (± 5%) | 18°C (± 2°C) | 50% (±5%) |
II | 23°C (± 2°C) | 30% (± 5%) | 13°C (± 2°C) | 65% (±5%) |
III | 23°C (± 2°C) | 30% (± 5%) | 3°C (± 2°C) | 85% (±5%) |
Areas of application
Classic areas where climate classes are used are:
- Apartment entrance doors
- Heated living rooms
- Basement exit doors
- Doors to small bathrooms (high humidity)
- Doors to unheated rooms
- Functional doors such as sound insulation, fire protection, or smoke control doors
