Understanding EN 1634-1 — The European Standard for Fire Door and Curtain Testing

EN 1634-1 is the harmonised European test method for the fire resistance of door, shutter, openable window and fire curtain assemblies, and it sits behind every fire rating BÖLDT publishes for both product ranges. For specifiers newer to the standard, it can initially read as a dense document — in practice, it is a rigorous, well-established furnace test methodology that underpins fire door and fire curtain certification across the UK and Europe.

What EN 1634-1 Actually Tests

EN 1634-1 governs fire resistance testing of door sets, shutter assemblies and openable windows — including fire curtain systems. A full-scale sample of the assembly, including its head box, guide rails, fabric and bottom bar for a curtain, or leaf, frame and hardware for a door, is installed in a test rig and exposed to a standardised time-temperature curve in a furnace. Throughout the test, the assembly is monitored continuously for three distinct failure criteria: whether flames or hot gases pass through the assembly (integrity), whether the unexposed face heats up beyond defined limits (insulation), and how much heat radiates from the unexposed face (radiation).

Reading E, EW and EI Classifications

The test results are translated into a classification under EN 13501-2 using a simple letter system. 'E' stands for Integrity — the barrier prevents flames and hot gases passing through. 'I' stands for Insulation — the unexposed face stays below a temperature that would ignite adjacent materials or injure occupants. 'W' stands for Radiation — limits the radiant heat transfer through the barrier even where full insulation is not achieved. A number follows each letter indicating the duration in minutes for which that performance was sustained — for example, 'E 120' means integrity was maintained for 120 minutes, while 'EW 60' means radiation control was maintained for 60 minutes.

Integrity vs Insulation — Why the Distinction Matters

Integrity (E) alone tells you the barrier won't let fire physically pass through. It does not tell you whether someone standing close to the unexposed face would be safe from radiant heat or surface temperature. This is precisely why applications with vulnerable or immobile occupants — hospitals, care facilities — are typically specified with an insulation (EI) requirement rather than integrity (E) alone. The added insulation requirement reflects the reality that patients and care staff may need to remain in close proximity to the barrier for longer during a phased evacuation, where radiant heat and surface temperature become safety-critical, not just structural, considerations.

How EN 1634-1 Supports UK and EU Compliance

Fire-rated curtain fabric and door assemblies are tested and certified by recognised independent test houses against the E/EW/EI/Sa nomenclature derived from EN 1634-1 and EN 13501. BÖLDT fire curtains are tested to EN 1634-1 and certified up to E 240 / EW 60, with results independently verified by Efectis and TÜV SÜD — giving specifiers a documented, traceable basis for demonstrating compliance with Approved Document B and BS 9999 to building control.