Fire Door Ratings Explained

As the buildings we build become more complex and densely packed, the importance of proper fire safety is more significant than ever. One of the key ways that we enhance fire safety in buildings is through the use of fire doors. They help to prevent the spread of fire and smoke between compartments in a building, helping to make safe evacuations easier. Not all fire doors are the same, though, which is why they have specific fire door ratings.

Read on to discover more about fire door ratings – looking at the different types available and the legislation that guides them.

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What Are Fire Door Ratings?

So, what is a fire rated door? Specialised fire doors are graded based on their ability to withstand fire under test conditions. These ratings are used to determine the right fire door for a given building, which ensures proper fire protection by delaying the spread of fire and smoke. The two key components of these ratings are:

Fire resistance: Typically noted as FD30, FD60, etc. where the numbers represent the minutes (30, 60) the door can resist fire.
Smoke control: Indicated with an ‘S’ suffix (e.g. FD30S) to signify the door’s capability to also resist smoke passage.

Understanding Fire Door Ratings

There are several different fire ratings for doors, all with different abilities to withstand the spread of fire and smoke. So when it comes to understanding what fire doors are, it helps to look at their ratings. Below is a general overview of these ratings:

FD30 and FD60

The numbers in fire door ratings such as FD30 and FD60 indicate the amount of time, in minutes, that a door can withstand fire. FD30 doors are designed to resist fire for 30 minutes, while FD60 doors can resist fire for 60 minutes. These doors are commonly used in residential and commercial buildings, providing a strong barrier that allows occupants additional time to escape and limits property damage.

FD90 and FD120

For environments requiring enhanced fire safety measures, such as high-rise buildings, industrial facilities, or areas housing valuable equipment, higher ratings like FD90 or FD120 are used. These doors can resist fire for 90 and 120 minutes, respectively.

Legal Requirements and Standards

In the UK, building regulations dictate specific requirements for fire safety and the use of fire doors. Approved Document B of the Building Regulations covers fire safety and outlines the rules for fire doors to ensure they adequately resist the spread of fire within a building.

BS 476 and EN 1634

Fire doors in the UK must meet the standards set out in BS 476. These standards assess the performance of fire doors in terms of their ability to withstand fire and heat. Compliance with these standards is verified through rigorous testing and is a must for ensuring the effectiveness of fire doors.

Certification and Testing

Third-party certification is an absolute must for fire doors. It ensures that the doors not only meet the required standards on paper but have also been independently tested to prove their capability to resist fire and smoke under real-world conditions. This certification assures the door’s performance and is often required for compliance with building regulations.

How to Choose the Right Fire Door

Choosing the right fire door begins with an assessment of the building and its specific needs. Key considerations include the layout of the building and the fire compartmentation strategy, which involves dividing a building into areas of manageable risk to contain fires within a controlled space.

Choosing the Right Rating

The choice of fire door rating should be based on several factors, including the building type, its usage, and occupancy levels. For instance, higher ratings like FD60 or FD90 might be necessary in buildings with longer evacuation times or increased fire risks.

Installation and Maintenance

The effectiveness of fire doors also depends on proper installation and regular maintenance. Make sure that installation is carried out by professionals – such as our experts at Ark Fire Protection – and that doors are regularly inspected and maintained to ensure their continuous functionality. Components such as seals, hinges, and door closers should be regularly checked to keep the fire door compliant with safety standards.

Understanding fire door ratings and the associated legal and safety requirements is vital for anyone involved in building management, construction, or design. By choosing the appropriate fire door rating and ensuring it’s correctly installed and maintained, you can significantly enhance the fire safety of a building, protecting both life and property.