EW is sufficient when a fire barrier must limit heat radiation across a compartment boundary, but the space on the other side does not require protection from heat conduction through the door itself. EI1 or EI2 is required when the door must also prevent the surface on the unexposed side from exceeding a defined temperature threshold, typically because people may be present near the door or because the adjacent compartment contains heat-sensitive materials or processes. The sections below work through the classification logic, the Dutch regulatory framework, and the documentation an architect needs to close a specification file.
What’s the difference between EW and EI fire resistance classifications?
EW and EI are two distinct fire resistance classifications defined under EN 13501-2, the European standard for classifying the fire resistance of construction products, including doors. Both classifications build on the E (integrity) criterion — meaning no flames or hot gases pass through the door. W means the door additionally limits radiant heat transfer through the door to below 15 kW/m² at a distance of one metre from the unexposed face. W is the Dutch standard baseline criterion for fire-resistant industrial doors. EI1 or EI2 means the door goes further still, limiting the temperature rise on the unexposed surface itself.
The difference is not one of quality but of function. An EW door controls the spread of flames and hot gases through the opening and reduces radiant heat in the adjacent space. An EI1 or EI2 door does all of that and also keeps the unexposed face cool enough to be safe for people in close proximity or to protect heat-sensitive processes on the other side.
What does the E criterion mean?
E stands for integrity. A door meeting the E criterion prevents the passage of flames and hot gases through gaps, joints, or the door leaf itself for the duration of its classification period. E is the baseline requirement that every fire-rated door must meet, regardless of whether it also carries W or I criteria.
What does the W criterion mean?
W stands for radiation reduction. A door meeting the W criterion limits radiant heat transfer through the door to below 15 kW/m² at one metre from the unexposed face. In the Netherlands, EW is the standard baseline classification for fire-resistant industrial doors. Whether EW is sufficient for a specific application depends on the project’s fire safety calculation — it is not a universal answer.
What does the I criterion mean, and why does EI1 differ from EI2?
I stands for insulation. It limits the average temperature rise on the unexposed face to no more than 140 K above the starting temperature, and the maximum rise at any single point to no more than 180 K. EI1 and EI2 are not interchangeable: they differ in how the insulation criterion is measured and applied. EI2 is the less strict criterion — it permits a higher temperature rise on the unexposed side and applies the measurement across the door leaf and frame in a way that allows somewhat higher local values. EI1 is the stricter criterion, applying tighter limits. Always verify which sub-classification is specified in the project’s fire safety documentation, because EI1 and EI2 have direct consequences for which certified products can be used. Never specify “EI” without the suffix.
When is an EW classification sufficient for a fire door?
An EW classification is sufficient when the compartment boundary must prevent fire spread and limit radiant heat, but sustained surface temperature on the unexposed side is not a critical safety factor. EW60 is the Dutch standard baseline for fire-resistant industrial doors, and it is a fully valid classification in its own right — not a lesser or provisional option. Whether it is sufficient for a specific project depends entirely on that project’s fire safety calculation.
EW doors are commonly specified in large industrial openings where the primary concern is containing a fire within a compartment rather than protecting personnel on the other side from thermal exposure. A logistics facility where a fire door separates two storage zones, with no workstations immediately adjacent to the door, may well be served by an EW classification. However, this is always a project-specific determination. No architect should assume EW is sufficient without a fire safety calculation confirming it — and equally, no one should assume EI1 or EI2 is automatically required simply because the building is a distribution centre or industrial facility.
It is also worth noting that EW60 and EW120 refer to the duration of the classification in minutes, not to a higher level of protection. An EW120 door provides the same type of protection as EW60, but for twice as long. Duration and classification type are separate variables in any specification.
When does a fire door need to meet EI1 or EI2?
A fire door must meet EI1 or EI2 when the fire safety design requires that the unexposed surface of the door remains below a defined temperature threshold for the duration of the classification period. This requirement typically applies when people may be present near the door during an evacuation, when the adjacent space contains heat-sensitive equipment or processes, or when the applicable regulations or the project-specific fire safety report explicitly prescribe an insulation criterion.
In practice, EI1 or EI2 classifications are more commonly specified in healthcare facilities, production environments where staff work close to compartment boundaries, and buildings where the evacuation route passes directly alongside a fire door. In these contexts, a door that radiates significant heat from its unexposed face — even without allowing flames or gases through — creates an unacceptable risk.
The choice between EI1 and EI2 is not a matter of preference. It follows from the test standard referenced in the project’s fire safety documentation. EI2 is the more common requirement in the Netherlands and across most of Europe. If the specification states EI without specifying the sub-classification, clarify with the fire safety engineer before ordering, because the distinction has direct consequences for which certified products can be used.
Metacon-Next’s fire-rated industrial doors are available across a range of EI1 and EI2 classifications — including EI1 30, EI1 60, EI1 120, EI2 60, EI2 90, and EI2 120 — all tested in accordance with EN 1634-1 and certified by Efectis. This means architects can specify the correct classification and source a product that demonstrably meets it, without having to reconcile conflicting documentation from the supplier.
How does the Dutch BBL determine the required fire resistance class?
The BBL (Besluit Bouwwerken Leefomgeving, formerly the Bouwbesluit) sets the absolute minimum fire resistance requirements for compartment boundaries and the openings within them. The BBL establishes a floor below which a design cannot go — it does not prescribe a single fixed classification for every situation, and its requirements do not change arbitrarily from year to year. What changes is the situation: a different building use, a deviation from standard compartmentalisation, or an additional regulatory layer can all require a heavier classification than the baseline.
The BBL may require, for example, that a compartment boundary achieves a minimum fire resistance of 60 minutes. Whether that boundary requires EW60, EI1-60, or EI2-60 depends on the function of the space, the evacuation strategy, and any additional requirements from sector-specific regulations, client specifications, or insurer requirements. Common reasons a heavier classification than the EW60 baseline may be required include:
- The project deviates from standard building regulations and a heavier classification is required as a result
- A sector-specific regulation applies — for example, PGS15 for chemical storage facilities can mandate a heavier fire classification
- The client or principal sets a stricter above-statutory requirement
- The insurer sets a stricter requirement
In all cases, the applicable classification must be established through a project-specific fire safety calculation, not assumed from a general rule. Architects working on industrial buildings in the Netherlands should also be aware that changing the use of a building, expanding a compartment, or adding a mezzanine level can trigger a reassessment of the required fire resistance classification. The BBL applies not only to new construction but also to renovation projects where the change of use constitutes a material alteration under the regulations. When in doubt, consult a qualified fire safety engineer or contact Metacon-Next directly.
What documentation proves a fire door meets its EW or EI classification?
A fire door’s compliance with its stated EW, EI1, or EI2 classification is demonstrated through a combination of a CE declaration of performance, a classification report issued by an accredited test body, and a valid fire resistance test report conducted in accordance with EN 1634-1. These three documents together give an architect, building inspector, or permitting authority the evidence needed to confirm that the product performs as specified.
The CE declaration of performance confirms that the product has been manufactured and tested in accordance with the relevant harmonised European standard. For industrial fire doors, two CE marking standards apply simultaneously: EN 16034, which covers fire- and smoke-resisting closing elements, and EN 13241, which applies to all industrial doors regardless of fire rating. Both are required — they are not interchangeable, and content or documentation that references only one of the two is incomplete. The classification report, issued by a notified body such as Efectis, translates the test results into a formal fire resistance classification that can be referenced in a specification or building permit application.
Environmental Product Declarations (EPDs) are increasingly required alongside technical compliance documents, particularly for projects pursuing BREEAM or LEED certification. An EPD is not a sustainability award or an environmental quality mark. It is a standardised information document, based on ISO 14044 and EN 15804, that quantifies the environmental impact of a product across its full lifecycle — from raw material extraction to end-of-life processing. Architects specifying fire doors for green-rated projects should confirm that the manufacturer can supply an EPD alongside the classification report and CE declaration. Metacon-Next published EPDs for eleven of its main product lines in 2025.
Metacon-Next publishes all certificates, classification reports, and EPDs publicly on its website. This is not a regulatory obligation, but it reflects a deliberate choice to give architects immediate access to the documentation they need at specification stage, without having to request it by email or wait for a sales contact to respond. For a specifier working under deadline pressure, the availability of complete documentation before order placement removes a significant source of project risk.
If you are working on a project where the fire resistance classification is still under discussion, or where you need to confirm whether a specific product meets the requirements of your fire safety report, the Metacon-Next technical team can provide product-specific documentation and support the specification process. Alternatively, you can request a quotation once the classification and opening dimensions are confirmed, and receive a product proposal that is aligned with your specification from the outset.
Locations where a change was made:
- Paragraph under “What documentation proves a fire door meets its EW or EI classification?” (second paragraph): “EN 13241-1” changed to “EN 13241”.
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