What Do EI30, EI60, EI90 and EI120 Mean? Fire Door Rating Guide.

E30, E60, EI30, EI60, EI90 and EI120 are among the classifications most frequently encountered when selecting a fire door. These codes are not product models or general quality grades. They describe fire-resistance performance established through specified testing and classification procedures.

What Does E Mean?

E stands for integrity. It indicates how long the doorset maintains its ability to resist the passage of flames and hot gases to the unexposed side. E60, for example, indicates 60 minutes of integrity under the conditions represented by the classification.

What Does I Mean?

I stands for thermal insulation. It evaluates the doorset's ability to limit temperature rise on the unexposed face. EI classifications are important where the design must limit both the passage of flames and the transfer of heat.

What Do the Numbers Mean?

The numbers 30, 60, 90 and 120 indicate the classification period in minutes:

• EI30: 30 minutes of integrity and insulation
• EI60: 60 minutes of integrity and insulation
• EI90: 90 minutes of integrity and insulation
• EI120: 120 minutes of integrity and insulation

An E120 door is not the same as an EI120 door. E120 declares integrity, while EI120 includes both integrity and insulation performance.

What Is the Difference Between I1 and I2?

Some documents use EI₁ or EI₂. These designations relate to different temperature-measurement positions and insulation assessment criteria. Rather than relying on a shortened “EI90” description, verify the full classification shown in the classification report and its field of application.

How Is a Fire Door Tested?

EN 1634-1 is a principal European test standard for the fire resistance of doors and shutter assemblies. The test specimen includes more than the leaf: the frame, hinges, lock, seals, glazing, fixings and supporting construction all contribute to the result. The performance is then expressed through the relevant classification standard.

Why Must Documentation Cover the Complete Doorset?

Fire performance does not belong to a single sheet of steel or core material. A different panic bar, larger vision panel, alternative frame, dimension outside the approved scope or substituted hinge can affect performance. Before ordering, verify:

• The complete classification stated in the report
• Permitted door dimensions
• Single- or double-leaf scope
• Wall and frame construction
• Glazing dimensions and system
• Approved locks, hinges, closers and panic hardware

Which Fire-Resistance Rating Is Required?

The correct classification depends on the building use, height, fire compartment, door location and approved fire safety design. The objective is not automatically to select the highest number, but to meet the required performance with a documented doorset suitable for the specific opening.

Conclusion

Understanding EI30, EI60, EI90 and EI120 is an essential technical step before comparing prices. Confirm that the door label and its test, classification and product documents are consistent, and determine the required rating with qualified project professionals.