Complete Guide to Fire-Rated Doors (EI60/EI120): How to Choose Correctly + Purchase Checklist

This guide is for end users, architects/designers, contractors, and building managers who need to choose a fire-rated door and want to quickly understand the differences, without unnecessary jargon. In a few minutes you will know when EI60 makes sense, EI90, and when EI120 is worth it, what E / I / EI / EI2 mean in short, and how that translates into day-to-day selection.

In addition to explanations, below you will find a mini decision table (to choose roughly based on the situation), an order checklist (the right questions + the documents you should request), and a short list of costly mistakes - things often seen in practice and easy to avoid.

We have been working for years in the Fire Safety field and we deliver certified fire-rated doors, and the reason for this article is simple: I often see the same issues repeating on site (incorrectly measured dimensions, wrong opening direction, missing accessories), even though the solution would have been just a few checks done in time.

1. EI60 vs EI120 and what E / I / EI / EI2 mean (explained clearly)

When you see "EI60" or "EI120" on a door, that number (60 / 120) refers to how many minutes the door maintains certain performance under standardized test conditions (i.e., in a laboratory test, under clear rules). In practice, this helps you choose the right door for the risk level and project requirements, without paying unnecessarily.

Mini-glossary

E = Integrity (tightness against flames / hot gases)
It means that, during the test, the door does not allow flames to pass through and limits the passage of hot gases to the unexposed side. Practically, "E" means the door remains a barrier that does not "break"/does not open due to critical deformations and does not let fire pass directly through it. In fact, the letter E comes from the French term Etancheite.

I = Thermal insulation (limiting heat transfer)
It means the door not only stops the flame, but also reduces heating of the face on the unexposed side. In other words, the door keeps the temperature on the other side below certain limits (measured in the test), thus reducing the risk of ignition of nearby materials and making evacuation/limiting fire spread safer.

EI = E + I (Integrity + Insulation)
If a door is classified EI, it means it meets both criteria: it stops flames/hot gases (E) and limits heat transfer (I) for the indicated period (e.g., 60 min or 120 min).

EI2 = a classification variant often seen on doors (especially on the "I" side)
In practice, you will often see doors marked EI2 60 or EI₂ 60. The "2" symbol represents a specific temperature-testing methodology, according to European standards (EN 13501-2).

• Index 2 (I2): Indicates that, during testing, the average temperature of the door leaf did not exceed 140C, and the maximum temperature at any point (at a distance of 100 mm from the edge of the leaf) did not exceed 180C.
• The I1 classification is stricter, with measurement performed only 25 mm from the edge. In Romania and in most of Europe, the EI2 standard is the most commonly used for civil and industrial buildings.

Laboratory tests

R = (Load-bearing capacity / mechanical resistance)
It comes from French (Resistance) or English (Resistance / Load-bearing capacity). This indicates the time interval (in minutes) during which a building element can maintain its structural stability under load during a fire, without collapsing.

• Why dont you usually see it on doors? Doors are considered compartmentation elements, not load-bearing elements of the building. That is why their standard marking is EI (Integrity and Insulation).
• When does REI appear? If the door is part of a load-bearing wall or a complex structural system that must also maintain load-bearing capacity, then the combined notation REI is used (e.g., REI 60).

2. Example: differences EI60 vs EI120

What EI60 (60 minutes) means

An EI60 door is designed to provide an effective barrier for one hour in the test:

• stops the passage of flames/hot gases (E)
• limits the temperature rise on the other side (I)
  Very often it is a common choice in areas where project requirements and the fire scenario indicate a "standard" compartmentation level for corridors, moderate technical spaces, storage without high risk, etc. (the final decision is given by the design/fire scenario).

What EI120 (120 minutes) means

An EI120 door takes the same principles further: it maintains the criteria for two hours in the test.
As a rule, EI120 becomes relevant in situations where stronger compartmentation is targeted, either due to risk or due to specific requirements (for example: higher-risk technical areas, certain types of buildings/flows, compartmentation explicitly required in the documentation).

3. Two important clarifications

1. "60/120 minutes" does not mean that any real fire stops exactly at 60/120 minutes.
   It means the door was tested under a standard curve/conditions, and the performance is classified according to the criteria. In reality, behavior depends on the specific scenario, installation, accessories, maintenance, etc.
2. The door classification is not just the "door leaf".
   For it to make sense in practice, the entire assembly matters: frame, hardware, seals, closer, panic bar (if applicable) and especially proper installation. That is exactly why, in the next chapters, you have the decision table + checklist + costly mistakes.

4. Decision table (EI60 vs EI90 vs EI120)

The following table can guide you toward making a decision when choosing one type of fire-resistant door or another.

Important note: the table is indicative. The final decision is validated with the designer and the fire safety scenario (requirements may differ depending on building type, use, risk and compartmentation).

5. Fire-rated door order checklist

From the experience gained both during installations and following subsequent customer requests (including complaints :)), we found it is essential to clarify in advance a series of technical and functional aspects. That is why, for every order, we ask customers a well-structured set of questions, with the goal of understanding as precisely as possible the requirements and conditions of use.

This process helps us identify potential risks and eliminate any gaps that could lead to problems or an unsuccessful installation. Over time, this approach led to the development of a detailed checklist, which may seem extensive at first glance, but does not need to be completed in full in every situation.

Download the fire-resistant door order checklist - (printable, 3 blocks, 1 page)

6. "Costly mistakes" - 6 common mistakes (and how to avoid them)

1) The wall opening is measured "by eye" (or only once)

What happens: you order the door at a size that does not fit;

• Opening too large:
  A large volume of filling material is needed - which must also be fire-resistant, therefore more expensive. In addition, the build-up can exceed the width of the frame edge that covers the filling, which leads to significant and unattractive touch-ups.

• Opening too small:
  Most of the time, the opening is not perfectly straight (trapezoidal). The door does not fit at the top or bottom, improvisations appear during installation, breakouts, time loss.

How to avoid it: measure in 3 points (top/middle/bottom) for width and height; note the wall thickness and the level of finishes (plaster, tile).

On site: "900x2100 opening" in the design, but in reality after finishes it remains 885x2087 -> the door was changed! :).

2) The opening direction (LH/RH) is chosen incorrectly

What happens: the hinges end up on the wrong side, the door hits a wall/object, or worse: it disrupts the flow and the evacuation route.

How to avoid it: Determine the door opening direction.

The standard rule is based on the position of the hinges when you pull the door toward you: Stand in front of the door so that you open it by pulling it toward you. In other words, you must stand on the side of the door where you can see the hinges.

Observe the hinge position:

• If the hinges are on the right side, the door is right-hand.
• If the hinges are on the left side, the door is left-hand.

On site: in the stairwell the door was ordered "right-hand", but it had to be "left-hand" so it would not block the handrail and would not reduce the passage width.

3) Fire-rated glass installed outdoors (sun + rain) - a "rare" but expensive mistake

What happens: fire-rated glass may develop issues over time due to exposure to water and solar radiation.

How to avoid it: if the door is outdoors, choose a solution without glass or a configuration with proper protection (details discussed during quoting: position, canopy/overhang, protections, glazing solution suitable for the environment).

On site: a "door with glass" was requested for a secondary exit exposed to rain; after a few months defects appeared at the edge area -> the configuration had to be redone.

Fire-rated glass

4) The "normally open" door is held with a doorstop/wood (instead of a controlled system)

What happens: in case of fire, the door remains open and you lose compartmentation exactly when you need it.

How to avoid it: These doors are physically kept open during normal activity to facilitate heavy traffic, but they close automatically in an emergency. They are held open by an electromagnet (magnetic hold-open). When the fire detection panel senses smoke, it cuts power to the magnet, and the closer arm closes the door immediately. Consequently, if the door must be kept open, you must use an electromagnetic hold-open, controlled and connected to the fire/smoke detection control panel (technically correct solution).

On site: the corridor door was "propped" open daily with a doorstop, a wooden wedge :); at the first Fire Safety inspection, an immediate correction was requested.

5) Missing damper/closer (or it is installed, but not adjusted)

What happens: the door is left slightly open "for convenience" or it slams, goes out of adjustment, and loses its real function as a barrier.

How to avoid it: on fire-rated doors, in many situations the closer is not "optional" in practice: choose it correctly and adjust it (speed, force, latching). Periodic checks = fewer problems.

On site: after 2 weeks, the door no longer stayed in the frame due to slamming; the hardware was replaced, even though the issue was adjustment.

Cam-action closer arm with slide rail.
Dual adjustment:
1. for closing speed and
2. for closing impact.

Door closer with rack-type operator and angled arm.
Dual adjustment:
1. for closing speed and
2. for closing impact.

6) Not all accessories are specified

What happens: the door "seems" complete, but during installation or afterward it turns out that additional accessories are needed / are specified in the design / specifications (for example: panic bars - mandatory in stores, cinemas, where it is assumed that more than 50 people must be evacuated; electromagnet and closer arm for normally open doors - according to regulations, these are not allowed to remain open if they cannot close automatically in case of fire).

How to avoid it: treat accessories as part of the door assembly, not as "extras". Specify from the start: panic hardware / access control / electromagnet / closer arm, so you receive the correct configuration.

On site: many times we send customers accessories in the period following the initial delivery.

Types of panic bars

7. FAQ - frequently asked questions about fire-rated doors (EI60 / EI90 / EI120)

1) "Is EI60 enough for...?"

In many projects, EI60 is a common choice for areas with moderate risk and "standard" compartmentation (internal circulation, simple technical rooms, spaces where the documentation does not explicitly require more). However, the correct answer is not a guess: check the fire safety scenario and the requirements in the design. If the design requires EI90 or EI120, the choice is made accordingly.

2) "Can I install the fire-rated door outdoors?"

It depends on the configuration and exposure conditions. For doors with fire-rated glass, there is an important warning in the documentation: exposure to water + sun can damage the fire-rated glass at the cut edge, which is why, in general, outdoor installation is not recommended without proper measures/protection.
If you need a door outdoors/semi-outdoors, discuss the right solution during quoting (no glass or adequate protection/manufacturing solutions).

3) "When do I need a panic bar?"

Typically, when the door is on an escape route or in an area with people flow where opening must be quick, intuitive, and safe. In design, requirements such as EN 1125 for panic devices are often targeted (depending on the scenario and the buildings purpose).
Important: the panic bar must be chosen compatible with the door and with the lock/hardware, not "added later" without checks.

Crossbar panic hardware "SLASH"

Crossbar panic hardware "TWIST"

4) "What minimum maintenance is required?"

The minimum that helps you avoid problems:

• Monthly/periodic check: the door closes fully, does not rub, does not remain ajar.
• Proper cleaning: mild solutions, no aggressive solvents; test on a small area if you are not sure.
• Accessories: the closer/damper must be functional and adjusted; seals must be intact; hardware must not be loose.

In short, maintenance does not mean "complicated", but simple checks that keep the door functional in everyday use, not just "on paper".