fire doors

A fire protection door is a specially tested door that prevents the spread of fire and smoke for a defined period of time in the event of a fire. It forms part of a certified system comprising the door leaf, door frame, fittings and gaskets, and meets specified building requirements.

Unlike conventional interior doors, fire protection doors feature a special construction and durable materials. Whilst standard doors primarily serve design and functional purposes in interior work, fire protection doors are specifically designed to withstand high temperatures and maintain their function even under extreme conditions.

The primary purpose of a fire protection door is to buy time in an emergency: it keeps fire and smoke at bay, protects adjacent areas and secures escape and rescue routes. In doing so, it makes a crucial contribution to personal safety and to limiting property damage in buildings.

So-called fire resistance classes categorise fire protection doors according to the length of time they provide protection in the event of a fire. These indicate how long a door maintains its protective function and withstands the fire.

The most common classes are:

• T30: fire-retardant – provides at least 30 minutes of shear resistance to fire
• T60: highly fire-retardant – withstands fire for at least 60 minutes
• T90: fire-proof – provides protection for a period of at least 90 minutes

The number describes the duration in minutes during which the fire protection door prevents the spread of fire. The higher the classification, the longer the protected area remains shielded in the event of a fire.

The fire resistance class required depends on the specific structural requirements, the use of the building and the legal regulations.

The use of fire protection doors is regulated by law in many areas and is governed by the relevant national building regulations as well as specific regulations for certain types of buildings. The aim is to protect people in the event of a fire and to effectively limit the spread of fire and smoke.

Fire doors are particularly commonly required in the following ranges:

• Escape and rescue routes: Here, they ensure that corridors and stairwells remain smoke-free and passable for as long as possible in the event of a fire.
• Public buildings: These include, for example, schools, hospitals, office buildings or places of assembly where safety requirements are heightened.
• Multi-occupancy buildings: Fire protection doors are used, for example, between separate units, in basements or in plant rooms.
• Special building areas: For example, in boiler rooms, underground car parks or at transitions between different fire compartments.

The specific requirements that apply always depend on the building’s intended use and the relevant building regulations. In practice, fire doors are therefore planned on a case-by-case basis and must be precisely tailored to the building in question.

Fire doors are constructed as a certified complete system in which all components are precisely matched to one another. Only the interaction between the door leaf, door frame, gaskets and fittings ensures that the door functions reliably in the event of a fire.

• Door leaf: The door leaf is made of specially formulated, fire-retardant materials. For example, compound constructions are used which can withstand high temperatures and maintain their rigidity over a defined period of time.
• Frame: The frame is firmly attached to the wall and forms the frame for the fire protection door. It must also meet fire safety requirements and ensures that the door closes tightly and does not fail in an emergency.
• Gaskets: Intumescent gaskets play a key role. These swell when exposed to heat and, in the event of a fire, seal the joints between the door leaf and the door frame. This further prevents the spread of fire and smoke.
• Fittings: Door handles, hinges, locks and locking mechanisms are also specially designed for fire protection. They ensure that the door can be used safely in everyday life and that it closes automatically and remains closed in the event of a fire.

Only when all components are installed as a tested unit does a fire protection door meet the necessary standards and provide the intended protection.

Clearly defined standards and test procedures ensure that fire doors perform their function reliably in the event of a fire. These regulations fix how long a door must withstand fire and under what conditions it is tested.

• DIN 4102 (Germany): This standard governs fire protection in the construction industry and defines, amongst other things, the familiar fire resistance classes such as T30, T60 and T90. It thus forms the base for many national requirements regarding
• EN 1634 (Europe-wide): At European level, the EN 1634 standard provides the description of the test procedures for the fire and smoke protection properties of doors. This ensures that fire doors are checked and assessed across Europe according to uniform criteria.
• CE marking: The CE marking confirms that a fire protection door complies with the applicable European requirements and has passed the control. Consequently, producers are not permitted to offer products without CE marking on the European market.

For planners, architects and building promoters, this means that only tested and certified fire protection doors meet the legal requirements and provide the necessary protection in an emergency.

To ensure that fire protection doors function reliably in an emergency, careful planning and professional assembly are crucial. First and foremost, planners consider structural requirements, the building’s intended use and legal regulations right from the planning stage.

Proper assembly is a key factor. Fire doors must only be assembled in accordance with the approved specifications, as even minor differences can compromise their protective effect. For this reason, assembly should only be carried out by qualified trade companies.

Furthermore, a fire protection door is always approved as a tested complete system. This means that the door leaf, casing, gaskets and fittings must be precisely matched to one another. Single components must not be combined or exchanged at will, as this would invalidate the building authority approval.

There is also a requirement for regular maintenance after assembly. Trade companies should therefore inspect fire doors at specified intervals to ensure they continue to function correctly. This includes, amongst other things, checking the locking mechanisms, gaskets and fittings.