When is a smoke door sufficient instead of a full fire door?

A smoke door is sufficient when the only regulatory requirement for a specific opening is to limit smoke spread, not to contain fire or heat. Under Dutch building regulations, this distinction depends on the fire compartmentation strategy defined in the project’s fire safety calculation, not on a blanket rule tied to building type or use. The sections below break down how that determination works in practice, and what architects need to document to justify their specification.

What is the difference between a smoke door and a fire door?

A smoke door is designed solely to restrict the passage of smoke, while a fire door is tested and classified to resist the spread of fire, heat, and, in some classifications, smoke, for a defined period. The two serve different functions under passive fire protection standards, and specifying one where the other is required creates a compliance gap that cannot be resolved after construction.

Smoke doors are classified under the S designation in European fire door standards. They are tested for smoke leakage at ambient temperature and, where relevant, at elevated temperature (denoted Sa and S200 respectively). They carry no fire resistance rating in terms of integrity or insulation, which means they will not prevent flames or radiant heat from passing through once a fire develops beyond its early stage.

Fire doors, by contrast, are classified according to EN 13501-2 and carry designations such as EW or EI1/EI2, followed by a time rating in minutes. The E criterion refers to integrity, meaning the door must not allow flames or hot gases to pass through. The W criterion limits radiant heat transfer on the unexposed face — this is the Dutch standard baseline criterion for fire-resistant industrial doors. The I criterion, in its two variants, addresses insulation: EI2 is the less strict criterion, permitting a higher temperature rise on the unexposed side, while EI1 applies a stricter limit on temperature rise on the unexposed surface. A fire door can also carry an S designation, meaning it provides smoke control in addition to fire resistance.

For architects specifying openings in industrial buildings, this distinction matters from the first line of the specification. Substituting a smoke door for a fire door, or specifying EW where EI1 or EI2 is required, will not pass a fire safety review. The classification must follow directly from the fire safety calculation for the project.

When is a smoke door enough under Dutch building regulations?

A smoke door is sufficient when the applicable fire safety calculation for a project determines that an opening needs to control smoke spread but does not need to provide fire resistance. This situation typically arises at internal boundaries within a single fire compartment, where occupant evacuation routes need to remain smoke-free but the compartment boundary itself is not crossed.

The BBL (Besluit Bouwwerken Leefomgeving, formerly Bouwbesluit) sets the absolute minimum requirements for fire compartmentation, but it does not prescribe a single door classification for every opening. The BBL defines the maximum permitted fire compartment sizes and the required fire resistance duration for compartment boundaries. Within those compartments, smoke control requirements apply to specific routes, particularly evacuation corridors and stairwells, where smoke doors may be the appropriate solution.

Where a door sits in a compartment boundary, a smoke door alone is not sufficient. The boundary must achieve the required fire resistance, and any opening in it must be closed with a product that carries the same or equivalent classification. A smoke door without a fire resistance rating cannot fulfil that function, regardless of how it is installed.

In practice, a smoke door is most often the correct specification for internal doors within a single compartment that serve evacuation routes, where the fire safety engineer has confirmed in writing that no fire resistance is required at that location. That written confirmation from the fire safety calculation is what an architect needs to document the specification decision.

What factors determine whether a project needs fire resistance beyond smoke control?

The primary factor is whether the door sits in or on a fire compartment boundary. If it does, fire resistance is required. Beyond that, several additional factors can raise the required classification above the BBL minimum. These include sector-specific regulations, insurer requirements, and project deviations agreed with the competent authority. The BBL sets only the floor, not the ceiling — the actual requirement for any given opening is determined by the project’s fire safety calculation.

The following factors are the most common drivers of elevated fire resistance requirements in industrial projects:

• Compartment boundary location: Any door forming part of a fire compartment wall must carry a fire resistance classification matching the boundary’s required duration. This is non-negotiable under the BBL.
• Sector regulation: Storage of hazardous substances under PGS15 guidelines, for example, imposes requirements that go beyond the BBL minimum and will affect which door classification is acceptable.
• Insurer requirements: Industrial property insurers frequently require fire resistance classifications that exceed the statutory minimum, particularly in logistics and production environments. These requirements are contractual, not regulatory, but they affect the building’s insurability.
• Change of use: When a building changes use, the fire safety requirements are reassessed against the new use. A building that previously required only smoke control may require full fire compartmentation after a change of use, depending on the fire safety calculation for the new situation.
• Project-specific fire safety deviations: Where a project deviates from the prescriptive BBL requirements, the competent authority may impose compensatory measures, which can include higher door classifications than the standard minimum.

Architects working on industrial construction or renovation projects should not assume that the BBL minimum is the ceiling. The fire safety engineer’s report is the definitive reference for each opening, and the door specification must align with it exactly. When in doubt about which classification applies to a specific situation, consult a qualified fire safety engineer or contact Metacon-Next directly.

Can a fire door also provide smoke protection?

Yes. A fire door can carry both a fire resistance classification and a smoke control designation, provided it has been tested and certified for both. In EN 13501-2 terminology, this is expressed by adding the S designation to the fire resistance classification — for example EI2 60-Sa or EI2 60-S200, where Sa indicates smoke control at ambient temperature and S200 indicates control at elevated temperature. Note that smoke control testing follows EN 1634-3, which is a separate test route from the fire resistance test under EN 1634-1; results from both are classified per EN 13501-2.

Not all fire doors are smoke-certified by default. The smoke control designation must appear explicitly in the product’s classification report and CE declaration of performance. Specifying a fire door without checking for an S designation when smoke control is also required at that location means the product may not meet the full specification, even if it passes the fire resistance requirement.

For architects, the practical implication is straightforward: when both fire resistance and smoke control are required at an opening, specify a product with both designations confirmed in its classification documentation. Metacon-Next fire-rated industrial doors are available with full technical documentation, including classification reports that clearly state all applicable designations, so the specification can be closed without ambiguity.

How do you specify the right door classification in a design file?

The correct approach is to derive the door classification directly from the fire safety calculation for the project, then document that classification in the specification with reference to the relevant EN 13501-2 designations, the required time rating, and any additional criteria such as smoke control. The specification must be traceable from the fire safety calculation to the product’s classification report.

A specification-ready entry for a fire-rated door in a design file should include the following elements:

1. Location reference: The specific opening or opening type, linked to the floor plan and fire compartmentation drawing.
2. Required classification: The full EN 13501-2 designation — for example EI2 60 or EW 60 — with any additional designations such as Sa or S200 where smoke control is also required. Always specify EI1 or EI2 explicitly; never write EI without the suffix.
3. Source of requirement: A reference to the fire safety calculation or the specific BBL article, sector regulation (such as PGS15), or insurer requirement that determines the classification.
4. Product requirements: CE marking under both EN 16034 (fire/smoke resisting closing element) and EN 13241 (industrial door), independent test certification (Efectis or equivalent), classification report, and EPD where required for BREEAM or LEED assessment.
5. Dimensional requirements: Clear opening dimensions, including any non-standard sizes that require a custom-manufactured product.

One of the most common specification errors in industrial projects is stating only the time rating without specifying the classification type. EI2 60 and EW 60 are not interchangeable. EW 60 limits radiant heat transfer — and is the Dutch standard baseline criterion — but does not meet the insulation criterion. If the fire safety calculation requires EI2 60, specifying EW 60 is a compliance failure, not a conservative choice. Whether EW or EI2 (or EI1) is required for a specific opening depends on the project’s fire safety calculation; if there is any uncertainty, consult a qualified fire safety engineer.

Architects who need to verify whether a specific product meets a defined classification can access full technical documentation directly through Metacon-Next, including classification reports, CE declarations, and EPDs. For industrial openings with non-standard dimensions or demanding operational requirements, the product range covers fire resistance classes from EI1 30 through to EI2 120 and EW 240 across multiple door types, all manufactured in-house and tested before delivery. When the specification is ready, requesting a quotation connects the project directly to a certified installer in the dealer network.

Closing a design file with confidence on fire-rated openings requires more than selecting a time rating. It requires a product with documented compliance, a manufacturer whose certification is current and publicly verifiable, and a specification that can withstand scrutiny at permitting and at any subsequent fire safety review. If you have questions about how a specific classification applies to an opening in your project, contact Metacon-Next directly for technical support.

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