Can Steel Set Doors Be Used as Fire Doors?

Yes, steel set doors can be used as fire doors, provided they have been designed, tested and installed for fire resistance.

This is an important distinction. Simply having a steel door does not automatically make it a fire door. The door needs to form part of a tested and suitable doorset, with the correct frame, seals, hinges, hardware and installation method.

For many commercial and industrial buildings, steel fire doors are a practical choice. They can provide strong fire resistance while also offering the durability needed in busy working environments.

But how do you know whether a steel set door is suitable for use as a fire door? What standards should you look for, and what does a fire rating such as FD30 or FD60 actually mean?

What Is a Steel Fire Door?

A steel fire door is a door manufactured and tested to resist the spread of fire for a specified period.

Steel is naturally resistant to fire, but the performance of a complete fire door depends on much more than the material used for the door leaf.

A fire door has to work as a complete system. This includes the door leaf, frame, hinges, locking hardware, seals, closer and any glazing or other components.

The Door & Hardware Federation (DHF) makes this point clearly. Its guidance states that the test evidence for a fire and smoke resisting door must apply to the door assembly that is installed. Even relatively small changes can affect fire performance.

This is why a standard steel personnel door should never simply be described as a fire door because it is made of steel.

The manufacturer needs to have evidence showing how that particular doorset performs in a fire test or through an appropriate assessment or certification scheme.

Can Steel Personnel Doors Be Fire Rated?

Yes, steel doors can be manufactured as fire-rated doors.

They are commonly used in commercial, industrial and other non-domestic buildings where a doorway needs to provide protection against fire spreading from one area to another.

For example, a steel fire doorset may be required between a warehouse and an office area, around plant rooms, in service areas or in other parts of a building where fire compartmentation is required.

UK government fire safety guidance specifically recognises the use of metal fire-resisting doors. It states that metal fire-resisting doors meeting the appropriate standard can often be used for the same purposes as timber fire doors. It also notes that metal fire-resisting door manufacturers will generally require bespoke frames and hardware for their doorsets.

The key point is that the steel construction is only part of the solution. The complete doorset needs to achieve the required level of fire resistance.

What Fire Rating Can a Steel Set Door Have?

Steel doors can be tested to provide different levels of fire resistance.

You may see ratings such as E30, E60, FD30 or FD60 when looking at fire doors.

The number refers to the period of fire resistance in minutes. For example, a 30-minute fire-resisting door is designed to maintain its required fire integrity for 30 minutes under the relevant test conditions.

The E classification refers to integrity. This is the ability of the doorset to prevent flames and hot gases passing through the door for the specified period.

Where smoke control is also required, you may see an additional S classification. Approved Document B uses classifications such as E30 Sa for certain applications where restricted smoke leakage is required.

The required rating depends on where the door is being installed and the fire strategy for the building. There is no single fire rating that is suitable for every application.

For this reason, the required rating should be established before choosing the door.

Which Standards Should a Steel Fire Door Be Tested To?

One of the main standards used for fire-resisting doorsets is BS EN 1634-1.

This standard covers fire resistance testing for doors, shutters and openable windows.

DHF guidance identifies BS EN 1634-1 as one of the relevant standards for demonstrating fire resistance. It also refers to BS EN 1634-3 for smoke leakage testing.

You may also come across BS 476-22 when looking at existing UK fire door installations and older specifications.

The important point for anyone buying or specifying a steel fire door is to ask for evidence of the door’s performance rather than relying on a statement such as steel construction or fire resistant.

The evidence should relate to the actual product and configuration being installed.

Why Does the Complete Steel Doorset Matter?

A common mistake is to look only at the door leaf.

Fire can find its way through gaps around the door, through unsuitable hardware or through weakness in the frame. The performance of the whole assembly therefore matters.

The frame needs to be suitable for the door and the fire rating being specified. Hinges, locks, handles, closers and other hardware also need to be compatible with the tested design.

The same applies to vision panels. If glazing is included, the glazing system needs to have the appropriate fire performance and be installed in a way that maintains the integrity of the doorset.

The latest edition of BS 8214, published in 2026, has widened its scope to cover fire-resisting and smoke-control doors made from materials including steel, aluminium, composite and timber. DHF’s guidance on the updated standard highlights the need to consider the fire door as a complete system.

This is particularly relevant when specifying steel set doors for commercial and industrial buildings.

Do Steel Fire Doors Need Intumescent seals?

In many fire doorsets, intumescent seals form an important part of the fire protection.

An intumescent seal reacts to heat and expands, helping to close the gaps around the door as temperature rises.

Smoke seals can also be required where smoke leakage needs to be controlled.

The exact seals and their location will depend on the tested doorset. They should be installed according to the manufacturer’s specification.

The seals should also be kept in good condition. UK government guidance for fire doors highlights the importance of checking that intumescent and smoke seals are undamaged and have not been painted over.

This is one reason maintenance matters after a steel fire door has been installed.

A door can have the correct fire rating when it leaves the factory, but damage, alterations or unsuitable replacement components can affect its performance.

Do Steel Fire Doors Need Self-Closing Devices?

When a fire door is required to provide fire separation, a suitable self-closing arrangement will generally be required.

The purpose is straightforward. A fire door needs to close so that it can perform its intended role if a fire occurs.

DHF guidance states that fire doors are generally required to be self-closing, with certain exceptions where they are kept locked shut when not in use.

The closer also needs to be suitable for the weight and design of the steel doorset.

This is particularly important with heavier industrial steel doors. The door must close properly without excessive force that makes it difficult for people to use.

Where Are Steel Fire Doors Commonly Used?

Steel fire doors are well suited to many commercial and industrial environments.

They can be used in warehouses, factories, distribution centres, plant rooms, workshops and commercial buildings where a robust door is required.

They can also be useful in areas where doors are likely to receive heavy use or where additional durability is important.

For example, a warehouse may need a fire-resisting personnel door between a storage area and a protected route. A manufacturing facility may require a fire-rated door around a plant room or between different fire compartments.

The correct specification will depend on the building’s fire strategy and the requirements of the opening.

What Does Approved Document B Say About Fire Doors?

For buildings in England, Approved Document B provides statutory guidance covering fire safety in buildings.

It includes requirements and guidance relating to fire compartmentation and fire-resisting doorsets.

The current Approved Document B guidance states that fire doorsets should have appropriate performance evidence and that the evidence should apply to the complete installed assembly. It also explains that small differences in the details of a doorset can have a significant effect on its fire rating.

This is important when replacing an existing steel door.

You cannot assume that a new steel door with similar dimensions will provide the same fire performance as the original door.

The frame, hardware, seals, fixings and installation details may all be relevant.

Approved Document B applies to England. Other parts of the UK have their own building regulations and guidance, so specifications for projects in Scotland, Wales or Northern Ireland should be checked against the relevant requirements.

Can an Existing Steel Door Be Upgraded to a Fire Door?

Sometimes an existing door can be upgraded, but this needs to be approached carefully.

A standard steel door should not simply be fitted with a few fire-resistant components and then described as a fire door.

There needs to be suitable evidence that the resulting doorset will achieve the required fire performance.

DHF guidance says that test evidence can take different forms, including a test report, an assessment by a fire test laboratory or third-party certification. The evidence must be applicable to the doorset that is installed.

This is where specialist advice can save time and prevent an expensive mistake.

If an existing steel set door is being considered for an upgrade, the manufacturer or a competent door specialist should be able to establish whether there is suitable evidence to support the proposed work.

Why Installation Is So Important for Steel Fire Doors

Even a correctly tested fire doorset can be compromised by poor installation.

The door needs to be fitted according to the manufacturer’s instructions and the supporting wall and surrounding construction need to be suitable.

The frame needs to be securely fixed. The correct seals need to be present. The door needs to close properly and the hardware needs to operate as intended.

DHF specifically highlights correct installation and maintenance as vital to ensure that fire doors perform as designed. It also recommends third-party certification schemes covering manufacture, installation and maintenance.

For a commercial or industrial building, this should be part of the specification from the beginning rather than something considered after the door has been ordered.

What Should You Ask a Steel Fire Door Supplier?

When specifying a steel set fire door, ask the supplier for evidence of the fire performance.

Find out which standard the door has been tested to and what fire rating it has achieved.

You should also establish whether the evidence covers the complete doorset, including the frame and hardware you intend to use.

If you require smoke resistance, check that this is included in the tested performance.

It is also worth checking whether the installer also offers ongoing maintenance. This can make it easier to ensure that the doorset remains compliant and performs as intended throughout its working life.

Industry organisations such as the Door & Hardware Federationhttps://www.dhfonline.org.uk/ provide technical guidance covering fire and smoke-resisting doors, while organisations representing the industrial door sector can also help businesses find competent specialists.

For larger projects, the fire strategy, building control requirements and advice from the relevant fire safety professionals should be considered alongside the door manufacturer’s technical information.

Are Steel Fire Doors Suitable for Industrial Buildings?

In many cases, yes.

Steel fire doors can be a practical option for industrial buildings because they combine fire resistance with the durability required in demanding working environments.

They are particularly useful where a personnel door needs to provide fire separation while also coping with regular use.

The important thing is to specify the door for the application.

A warehouse, manufacturing facility and distribution centre can have very different fire risks and operating conditions. The door specification needs to reflect the location, required fire rating, frequency of use and any requirements for smoke control or escape.

A fire-rated door should therefore be treated as part of the building’s overall fire safety system.