Author: Site Editor Publish Time: 11-03-2026 Origin: Site
Fire-rated door hardware is one of those topics that rarely gets discussed until something goes wrong. But for architects, specifiers, and building owners sourcing hardware for commercial or residential projects in Europe, understanding fire resistance standards is non-negotiable. The EN 1634-1:2014+A1:2018 standard, in particular, sets the benchmark for how door assemblies—including locks—perform under fire conditions.
This guide breaks down what EN 1634-1:2014+A1:2018 actually tests, why it matters for Euro mortise locks, and what to look for when evaluating certified hardware.
EN 1634-1 is a European standard that defines the fire resistance testing methodology for door and shutter assemblies. The 2014 edition, updated by Amendment 1 in 2018, specifies how complete door sets—frames, leaves, hardware, and all—must perform when exposed to fire.
The test measures several performance criteria, including:
Integrity (E): Whether the assembly prevents the passage of flames and hot gases
Insulation (I): Whether the assembly limits heat transfer to the unexposed face
Radiation (W): Whether the assembly limits heat radiation to a defined threshold
A door assembly that passes EN 1634-1 testing earns a classification based on how long it maintains these criteria. A rating of 26 minutes means the assembly maintained its integrity for at least that duration under controlled fire test conditions.
Critically, the standard tests the full door assembly—not the lock in isolation. This means that a Euro mortise lock's fire rating is only valid when installed in the specific door configuration that was tested.
A Euro mortise lock is a lock body fitted into a mortise (a cavity cut into the door edge) and designed to accept a euro profile cylinder. This design is the dominant standard across European markets and is widely used in commercial buildings, hotels, schools, and multi-unit residential developments.
When a Euro mortise lock is tested under EN 1634-1, the assembly must hold together and continue to function as a barrier against fire for the rated duration. The lock body, latch, deadbolt, and any additional anti-latch features must all remain operational or at least structurally intact throughout the test.
Keyman Lock's M5 Series Euro mortise lock, for example, carries the following EN certifications:
EN 12209:2003+AC:2005 — The European standard for mechanical locks, which covers durability, strength, and operational performance
EN 1634-1:2014+A1:2018 — Fire resistance rating of 26 minutes
CE Marking (CE No. 0905-CPR-250072-01) — Confirms conformity with relevant EU construction product regulations
The 26-minute fire resistance classification is achieved on door thicknesses of 1-3/4" (45mm) as standard, with optional compatibility for 1-3/8" (35mm) and 2-1/2" (64mm) doors. Door thickness directly affects fire performance, so matching the lock to the correct door specification is essential.
Before specifying a Euro mortise lock for a fire-rated application, it helps to understand how EN 12209 grades work. This standard classifies locks across multiple performance categories, including:
Grade 3 — Covers durability (number of operational cycles), bolt strength, and security resistance. Keyman's M5 Series locks are EN 12209 Grade 3 certified, which means they meet the requirements for medium-to-high security commercial applications.
The specific certification references for the M5 Series include:
EN 12209:2003 3X910G-B020
EN 12209:2003 3X910G3BC00
EN 12209:2003 3C910G3BC00
Each of these codes describes a combination of characteristics under the EN 12209 classification system, including the lock grade, key operation, bolt type, and other functional attributes. When sourcing hardware for a project, matching the correct classification to the door type and security level required is critical.
Access control integration is increasingly common in commercial buildings. A Euro electrified mortise lock combines the mechanical function of a standard euro mortise lock with an electric actuator—either a solenoid or motor—that allows the lock to be controlled remotely.
The key consideration for fire-rated applications is how the lock behaves during a fire event. Most electrified mortise locks are configured to fail-safe (unlocking upon power loss) or fail-secure (remaining locked upon power loss). Fire safety codes in most jurisdictions require that doors on fire-rated egress paths fail in the safe (unlocked) position, allowing occupants to exit freely.
For specifiers evaluating a Euro electrified mortise lock, the following questions matter:
Has the electrified version been independently tested to EN 1634-1, or does only the mechanical version carry a fire certificate?
What is the fail-safe/fail-secure configuration?
Does the lock maintain integrity in both powered and unpowered states during a fire test?
These distinctions matter because a mechanical fire certificate does not automatically transfer to the electrified variant of the same lock. Always verify that the specific model and configuration has been tested and certified.
A Euro mechanical mortise lock is the traditional, non-electrified version of a euro profile lock. For fire-rated door assemblies, mechanical locks tend to be the more straightforward option from a certification standpoint—there are no electrical components to consider, and the test configuration is simpler to replicate in the field.
When specifying a Euro mechanical mortise lock for a fire door, the following checklist applies:
Confirm the door thickness matches the tested assembly. A lock certified at 45mm may not maintain its rating when installed on a 35mm door without a separate test confirming that configuration.
Check the full EN 12209 classification string. The grade, bolt type, and function code should all align with the project requirements.
Verify the CE marking and certificate number. CE marking is mandatory for construction products sold in the EU and confirms the product has been tested by a notified body.
Use the correct strike plate and door furniture. Fire tests are conducted on complete assemblies. Substituting components—including escutcheons, handles, or cylinders—can void the fire certification.
A 26-minute fire resistance period might sound modest compared to ratings commonly seen on fire doors (which often reach 30, 60, or even 120 minutes). However, the EN 1634-1 test is rigorous. The furnace conditions used in testing follow a standard time-temperature curve that reaches approximately 700°C within the first 10 minutes.
A 26-minute classification means the lock and door assembly held together—without flames, hot gases, or structural failure—for the full test duration under these conditions. For many applications, particularly in residential and light commercial settings, this level of protection satisfies local building code requirements.
Always consult the relevant national building regulations and fire safety codes for the specific jurisdiction. Fire rating requirements vary by occupancy type, floor level, and the role of the door within the fire compartmentation strategy of the building.
Specifying hardware for a fire-rated door application is a decision with real safety consequences. The EN 1634-1:2014+A1:2018 standard provides a reliable, tested framework for evaluating performance—but only when the hardware is installed exactly as tested.
Keyman Lock's M5 Series Euro mortise lock range, certified to EN 12209 Grade 3 and EN 1634-1 with a 26-minute fire rating, offers a verified solution for commercial and residential fire door applications. The range is available in mechanical and electrified configurations, across multiple backset and door thickness options.
For detailed specifications, CE certificate documentation, or to discuss a specific project requirement, contact the Keyman Lock team directly at keymanlock.com.
