EN 1634-1 is the European test standard that defines how fire doors and shutters are tested under controlled fire conditions to determine their fire resistance performance. It specifies the test method, the furnace conditions, the performance criteria, and the classification system that determines whether a door qualifies as EW, EI1, or EI2. For architects and specifiers, EN 1634-1 is the technical foundation behind every CE-marked fire door on the European market. The sections below unpack the most common questions around the standard, from what it actually measures to what documentation a compliant door must carry.
What does EN 1634-1 actually test in a fire door?
EN 1634-1 tests a fire door assembly under standardised fire exposure to measure how long it maintains two core functions: integrity (preventing flames and hot gases from passing through) and insulation (limiting the temperature rise on the unexposed side). The test is conducted in a certified furnace following the standard time-temperature curve defined in EN 1363-1, and the door is assessed at fixed time intervals throughout the exposure.
During the test, the door is mounted in a representative frame and subjected to fire from one or both sides, depending on the intended application. Sensors measure the surface temperature on the cold side, and observers check for integrity failures such as sustained flaming, gaps, or collapse. The results are recorded and used to classify the door according to how many minutes it maintained each criterion.
It is important to understand that EN 1634-1 tests a complete assembly, not just the door leaf. The frame, hardware, seals, glazing, and any hold-open or closing mechanisms are all part of the tested configuration. A door that passes the test in one configuration does not automatically pass in a different frame depth, with different hardware, or with a different glazing ratio. This is why test reports are specific to a defined product scope, and why extending a classification beyond its tested parameters requires additional evidence or a new test.
For architects specifying fire-rated industrial doors, this means the test report is not a general performance certificate for a door model. It is a record of a specific assembly performing to a specific level under specific conditions.
What is the difference between EI1, EI2, and EW classifications?
EI1, EI2, and EW are fire resistance classifications defined under EN 13501-2, based on the performance criteria measured during EN 1634-1 testing. These classifications describe how long a closed door withstands fire — they are not a measure of how combustible the door material is, which is a separate classification system (EN 13501-1) that does not apply to Metacon-Next’s standard product range.
E stands for integrity: flames and hot gases are prevented from passing through the door. W adds radiation reduction — it limits radiant heat transfer through the door to below 15 kW/m² on the unexposed side. EW is the Dutch standard baseline criterion for fire-resistant industrial doors, and it does not control surface temperature. EI1 and EI2 both require integrity plus insulation, meaning the average temperature rise on the cold face must stay within defined limits. EI1 applies a stricter criterion — the temperature rise on the unexposed side is limited to a lower threshold. EI2 is less strict — a higher temperature rise on the unexposed side is permitted, with the maximum at any single measurement point set at 180°C above the starting temperature.
The practical difference between EI1 and EI2 matters most when people are likely to be close to the unexposed face of the door during a fire event. In applications where evacuation routes pass directly alongside a fire door, EI1 offers the highest level of thermal protection on the unexposed side.
EW is sometimes mischaracterised as a lower-quality classification, but that framing is misleading. It is a different performance criterion, not a weaker one in all respects. Whether EW, EI1, or EI2 is appropriate for a given opening depends on the fire safety calculation for that specific project, not on a general rule. The BBL (Besluit Bouwwerken Leefomgeving, formerly Bouwbesluit) sets only the absolute minimum requirement. Project-specific deviations, sector regulations such as PGS15 for chemical storage, insurer requirements, or client specifications may all require a higher or more specific classification. Which classification applies to your project is a question for a qualified fire safety engineer or the local authority — not something that can be answered by a general rule.
Always specify EI1 or EI2 explicitly in any specification document. Never use EI without the suffix. The two represent meaningfully different performance levels, and an unqualified EI reference creates ambiguity that can cause problems during permitting or a fire safety review.
How does EN 1634-1 relate to CE marking for fire doors?
CE marking for fire doors in Europe is governed by the harmonised standard EN 16034, which references EN 1634-1 as the underlying test method for fire resistance performance. A fire door cannot carry a CE mark for fire resistance unless it has been tested in accordance with EN 1634-1 by a notified testing body, and the results have been assessed and certified by a notified product certification body. The CE mark is the manufacturer’s declaration that the product meets the requirements of the applicable harmonised standard.
For industrial fire doors, two CE-relevant standards apply simultaneously: EN 16034, which covers the fire- and smoke-resisting closing function, and EN 13241, which applies to industrial, commercial, and garage doors and gates generally. Both are mandatory and must not be treated as interchangeable or alternative routes — an industrial fire door must satisfy both.
For architects, CE marking is not a design choice. Under the Construction Products Regulation (CPR), CE marking is mandatory for fire doors placed on the European market where a harmonised standard exists. A door without a CE mark for fire resistance cannot legally be specified for a fire-rated application in any EU member state.
What CE marking does not do is confirm that a door is suitable for a specific application. It confirms that the door has been tested, classified, and documented according to the harmonised standard. The architect or fire safety engineer is still responsible for determining whether the classification achieved is appropriate for the opening in question, based on the project’s fire safety calculation.
Metacon-Next’s fire-rated industrial doors are CE-certified and tested by Efectis, a recognised notified body, meaning the classification reports and CE declarations are available as part of the standard documentation package. This is the level of evidence a permit-ready specification requires.
Why do fire door test results not always transfer between products?
Fire door test results under EN 1634-1 are valid only for the specific assembly configuration that was tested. When a manufacturer changes the door leaf thickness, the frame profile, the sealing system, the hardware specification, or the glazing area, the existing test result may no longer apply. EN 1634-1 and the associated classification standard EN 13501-2 allow for limited extrapolation beyond the tested configuration, but only within defined parameters set out in EN 15269, the extended application standard for fire and smoke door results.
EN 15269 defines the rules for applying a test result to variants of the tested product, such as different sizes, different frame materials, or different leaf configurations. These rules are not unlimited. A door tested at one size cannot automatically be classified at a significantly larger size unless the extended application rules explicitly permit it, or unless a new test has been conducted.
This has direct consequences for specifiers working on industrial projects. Large or atypical openings, such as wide-span roller doors for forklift passages or oversized sliding doors for logistics facilities, often fall outside the tested scope of standard fire door products. In those cases, the manufacturer either needs to demonstrate that the extended application rules cover the required dimensions, or the product needs to be tested at the required size.
When sourcing fire-rated doors for non-standard openings, always ask the manufacturer to confirm in writing that the classification report covers the specified dimensions and configuration. A classification number alone is not sufficient evidence. The test report scope and any extended application documentation are what give a specification its legal and technical grounding. You can contact Metacon-Next directly to request this documentation for any product in their range.
What documentation should a fire door carry under EN 1634-1?
A fire door that has been tested under EN 1634-1 and CE-marked under EN 16034 must be accompanied by a specific set of documents. The minimum required documentation includes a Declaration of Performance (DoP), which states the declared fire resistance classification, the applicable harmonised standard, and the notified body involved in the certification. The door must also carry a CE marking label with a reference to the DoP.
Beyond the mandatory minimum, architects and specifiers working on permit-ready projects typically need the following:
- Classification report: The formal output of the EN 1634-1 test, confirming the classification achieved and the exact product configuration tested, including frame dimensions, hardware, seals, and glazing if applicable. For Metacon-Next products, these reports are issued by Efectis.
- Extended application report (if relevant): Documentation confirming that the specified dimensions or configuration fall within the scope of EN 15269 extrapolation rules.
- Installation instructions: EN 16034 requires that fire doors are installed in accordance with the manufacturer’s instructions. These instructions are part of the certified product scope and must be followed to maintain the validity of the classification.
- Environmental Product Declaration (EPD): Not required under EN 1634-1, but increasingly required for BREEAM or LEED projects. An EPD is a standardised document based on a life cycle assessment that quantifies environmental impact — it is not an environmental quality award. Metacon-Next published EPDs for eleven of its main product lines in 2025.
Metacon-Next publishes all of this documentation, including classification reports, CE declarations, and EPDs, openly on its website. This is not an industry requirement, but it reflects a commitment to the kind of transparency that architects need when closing a design file. If a supplier cannot provide the full documentation package before order placement, that is a specification risk worth taking seriously.
For architects working on industrial projects across Europe, having this documentation in hand before a fire safety review or building permit submission is the difference between a smooth process and a costly delay. You can request a quotation from Metacon-Next and receive the relevant technical documentation alongside it, or explore the full product range to identify which fire door type fits the opening requirements of your project.
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