A Fire Door Framework: Why Every Component Counts
Iain Banks of Allegion UK provides a detailed guide on the functional hardware behind fire doors, exploring how each component plays a vital role in protecting people, property and compliance.
Passive fire protection and fire door hardware are intrinsically linked. Fire doors are tested as a complete assembly of certified hardware components, with performance relying on the coordination of each individual ironmongery product. Hinges, door closers, locks, latches, handles, seals and signage all have a role to play, and their ability to work in tandem is what often determines whether a fire door can perform as intended.
This crucial partnership is designed to contain fire and smoke when it matters most. However, even a seemingly minor fault – whether a loose hinge, damaged seal or an incorrectly adjusted door closer – can compromise the performance of an entire fire door assembly. If one element fails, the safety of a building and its occupants is put at risk. With this in mind, careful attention must be given to the specification, installation and ongoing maintenance of fire door hardware. Iain Banks of Allegion UK explains more:
Door Furniture
“An appropriate handle is fundamental to the safe operation of a fire door. Where decorative hardware may suit an aesthetically driven application, fire doors are functional, and as such, door furniture should prioritise durability, practicality and ease of operation. There are two common handle types found on fire doors. Lever handles are typically fixed to latched fire doors, providing intuitive operation from either side of the door. Pull handles on the other hand, are generally used on unlatched doors and are particularly useful on larger, heavier fire doors where they are often paired with push plates.
“Specification aside, door furniture must always remain securely fixed, with handles operating smoothly and returning freely to a horizontal position after use. Loose, damaged or missing handles can prevent the latch from engaging correctly, compromising the door’s ability to provide effective compartmentalisation. To improve the durability of handles, bolt-through fixings are recommended as they secure the furniture through the door and the lock or latch case, reducing the likelihood of screws moving or loosening over time. Always remember, by securing installations this way, the door leaf is penetrated, and so, each fixing and component must be suitably fire-rated and compatible with the certified door assembly to maintain performance.”
Hinges
“Fire door hinges perform one of the most demanding roles within the assembly by facilitating the necessary pivot action that provides movement to the door. To support the height and weight of a standard fire door, most timber assemblies require the installation of at least three certified hinges, with each positioned on the vertical edge of the door leaf and frame. For larger, heavier doors standing over 2.2 metres tall, a fourth hinge may be necessary.
“In order to withstand frequent opemergencyening and closing cycles, accurate installation and regular maintenance is essential here. Each hinge must be present with all fixings secured using the correct screws supplied or specified by the manufacturer. Should a fire door become difficult to operate, it’s important to check hinges for loose screws, signs of metal fragments or excessive oil leakage, all of which may indicate signs of wear. When damaged hinges are identified, they must be replaced with like-for-like certified products, with CE, UKCA or BS EN 1935 marks present and installed in accordance with the manufacturer’s instructions.”
Door Closers
“Door closers also play a central role in the movement of fire doors and are often regarded as one of most critical life-saving devices in passive fire protection. Typically fixed to the top face of the door leaf, concealed inside a mortised pocket or built into the floor beneath the door pivot point, door closers provide the controlled closing action that ensures a fire door has reliably closed after every use. Controlled opening speeds also help to minimise a fire door’s misuse by reducing impact damage. Such is their importance to fire door safety, closers are required on all flat entrance doors and fire doors located on escape routes.
“Should a fire door fail to close and engage with the latch successfully, it may be that the closer has been incorrectly installed or damaged and, therefore, needs correcting or replacing. In some cases, a door closer may have been inappropriately adjusted or even mistakenly – or purposely – disconnected, completely invalidating the reliability and fire rating of the door assembly. Routine inspections should confirm that the door closer is present, is securely fixed and shows no signs of damage that may be stopping the door from closing from any open position. When checking the condition of a door closer, the door should close and engage the latch as intended when released from an approximate angle of 5° or 75mm.”
Locks, Latches and Cylinders
“Where door closers are responsible for returning the door to its closed position, locks and latches make sure it remains securely closed. This is critical in a fire situation, where certified fire doors can keep fire and smoke at bay for 30 or 60 minutes – when rated FD30 or FD60 respectively. Both locks and latches should always be fire tested as part of the complete door assembly. In fact, removing latches or replacing them with products that have not been tested can invalidate certification and compromise fire door integrity.
“When it comes to routine maintenance, it’s important to check for sticking mechanisms, misaligned strike plates and metal dust deposits, which are typically located on the latch bolt or strike plate, and could represent high levels of wear or damage. The latch must engage fully into the strike plate and hold the door firmly in place every time it closes. Where a lock incorporates a cylinder, that too must be compatible with the tested lockcase and operate smoothly without excessive resistance. A cylinder should be considered part of the fire door assembly, with incompatible hardware potentially affecting both fire performance and security, and as such, replacements should always be supported by suitable test evidence.”
Hold-open and Exit Devices
“Hold-open and exit devices are specialised hardware components that provide safe, single-action egress on fire doors. An electromagnetic hold-open device can legally hold open fire doors, allowing for a greater flow of movement in high traffic areas, whilst being primed to automatically release the door when its connected fire alarm system is activated. These devices should be tested to BS EN 1155. It’s also important to recognise that using wedges or other improvised methods to hold open a fire door is unlawful and dangerous. Should an electromagnetic hold-open device not release the door when a fire alarm is activated, a problem may have occurred, such as the door straining against its self-closing device upon operation.
“Panic and emergency exit devices are designed to provide safe and rapid escape with minimum effort. As such, devices must be securely fitted and functioning correctly at all times to ensure reliable operation at any given moment. Poor maintenance and unsuitable hardware replacements are common issues and can affect the mechanical operation of a system, and therefore the door. Emergency exit devices and panic exit devices must comply with BS EN 179 and BS EN 1125 respectively, together with appropriate UKCA and CE marking. This way, fire doors can efficiently maintain the balance of rapid evacuation when open and dependable protection against fire and smoke when closed.
Intumescent and Smoke Seals
“Intumescent seals are concealed around the frame or door leaf and whilst going largely unnoticed during the operation of a door, they spring into immediate, critical action during a fire. When exposed to the high temperatures of fire, intumescent seals will expand significantly, and in doing so, they close the gap between the door leaf and frame, creating an effective barrier against smoke and fire.
“Smoke seals provide additional protection by restricting the passage of smoke before temperatures become high enough for intumescent seals to activate. The inhaling of smoke is one of greatest risks to life in the event of a fire and so, over time, seals should be regularly inspected for damage. Excessive gaps between the side of the door and the frame could remove any compartmentalisation efforts. With this in mind, a maximum gap of 3mm is recommended around all fire doors, whilst ensuring both intumescent and smoke seals remain intact and undamaged. Simply put, seals are an essential element of fire door safety.”
Fire Door Signage
“Fire door signage is often the final piece of the compliance puzzle. ‘Fire Door Keep Shut’, ‘Automatic Fire Door Keep Clear’ and ‘Fire Exit Keep Clear’ signs are mandatory on all fire doors in the UK as per the Regulatory Reform (Fire Safety) Order 2005. They provide clear instructions to a building’s occupants and visitors and as a result, must remain present, legible, undamaged and appropriate for the door’s function.”
Each of these hardware components performs its own specific function, though, no single ironmongery product can compensate for the failure of another. In truth, the true strength of a fire door lies in how each piece of hardware works together and for that reason, fire door hardware should never be viewed in isolation. Only when every component is recognised for its role, and subsequently specified, installed and maintained correctly, can a fire door assembly perform as intended. When the hardware is right, lives are better protected, damage is limited and compliance is achieved.
For more information please visit www.allegion.com.
