# Fire-Rated Door Assemblies: What the Rating Covers and What Voids It

> A fire-rated door is a doorset (leaf, frame, hinges, closer, lock, seals and any glazing) that has passed a fire-resistance test as a complete assembly. Its rating states how long it kept fire and smoke from passing (integrity) and, where claimed, limited heat on the safe side (insulation). Change a component outside the test evidence and the rating no longer applies.

## What a fire rating on a door actually means

A **fire-rated door** is a doorset that has been built, installed in a test wall
and exposed to a standard furnace fire until it failed or the test ended. The
rating records how long it met the performance criteria. That rating belongs to
the whole assembly that was tested: leaf, frame, hinges, closer, lock and latch,
intumescent and smoke seals, any vision panel and its glazing beads, and the
fixing into the wall.

That is the most expensive misconception about fire doors. Buyers order "a
fire door" as a product and then let the site fit a different frame, hardware
from another supplier and a vision panel cut on site. Each change takes the
door outside its test evidence. The cost shows up at handover inspection, when
doors have to be replaced rather than adjusted, and in the worse case, in a fire,
when a door that looked right fails early at a gap or a hinge.

## Integrity, insulation and how the test works

| Criterion | What is measured | Notation (EN 13501-2) |
| --- | --- | --- |
| **Integrity** | Flames or hot gases passing through gaps, cracks or around the edges | E followed by minutes, e.g. E 60 |
| **Insulation** | Temperature rise on the face away from the fire | EI followed by minutes, e.g. EI 60 |
| **Smoke control** | Leakage of cold and medium-temperature smoke | S suffix, tested separately |

The examples show notation, not what any door needs. In a test, the doorset is
fitted in a wall and heated on one side following a standard time-temperature
curve while the furnace pressure is controlled. Examiners watch for flaming on
the unexposed face, use cotton pads and gap gauges at the edges, and measure
surface temperatures.

The test standards that appear on fire door reports:

- **IS 3614:2021**, the Indian specification for fire doors and doorsets
- **IS 17518 (Part 1)**, the Indian adoption of ISO 3008-1 for fire testing
  door and shutter assemblies
- **EN 1634-1**, the European fire resistance test for doors, with results
  classified under **EN 13501-2**
- **BS 476-22**, an older British method, now withdrawn but still common on
  test reports
- **UL 10C**, the North American positive pressure test, where the furnace
  pushes hot gas through the upper gaps of the door

Whether a door rated under one standard is accepted on a given project is a
question for the fire consultant and the authority having jurisdiction. Ask
which standard the report uses before comparing two quotations.

## The parts that make or break the rating

**Frame and fixing.** The frame profile, material, fixing centres and the gap
packing between frame and wall must match the test. A rated door in a
partition that is not itself rated protects nothing; the wall must carry the
same rating, built to its own tested system (see
[metal stud framing](/materials/metal-stud-framing)).

**Hinges, locks and closers.** Hardware is tested with the door. Closers are
commonly specified to **EN 1154**, whose annex covers use on fire and smoke
doors. Swapping to an unlisted lock, adding a hold-open wedge, or removing a
closer because the door is "heavy" all break the assembly.

**Seals and gaps.** Intumescent strips in the leaf edge or frame swell in a fire
to close the gap. The gaps around the leaf and at the threshold must stay within
what the test evidence allows. A leaf planed down to clear a new floor finish, or
a threshold gap left large for a carpet that was never laid, is a common reason
doors fail inspection.

**Glazing.** A vision panel must use fire-resistant glass and a glazing system
tested in that door. The glass alone does not carry the rating, as explained in
the note on [fire-rated glass](/glossary/fire-rated-glass).

**Labels and signage.** A permanent label or mark on the leaf and frame lets an
inspector trace the door to its test evidence. Signage such as "fire door keep
shut" is set by the fire strategy.

## Common mistakes

- **Mixed suppliers.** Leaf from one source, frame and hardware from others, and
  no report covering the combination.
- **Vision panels cut on site** with ordinary glass or untested beads.
- **Doors planed or trimmed** after the floor finish changed.
- **Closers removed or disconnected** because users found the door heavy.
- **Services run through the wall above the door** without fire stopping, so
  the wall fails around a perfectly good door.
- **Access control fitted later** with a lock or strike not covered by the test.

## What to ask your contractor or supplier

- Which test standard and report covers the complete doorset, including this
  hardware and glazing?
- Does the product carry certification under IS 3614?
- What are the permitted gaps, and how will they be checked at handover?
- Which closers, hinges and locks are approved for this door?
- Who fixes the frame, and to what detail?
- What inspection and maintenance regime does the manufacturer recommend?

For fire safety during the works themselves, including temporary protection of
escape routes, see
[fire safety during fit-out works](/blog/fire-safety-during-fit-out-works).

## Standards referenced

Fire doors and doorsets under **IS 3614:2021**, and fire resistance tests for
door and shutter assemblies under **IS 17518 (Part 1)**. European fire resistance
testing under **EN 1634-1**, with classification under **EN 13501-2**. Older
British testing of non-loadbearing elements under **BS 476-22**. North American
positive pressure testing under **UL 10C**. Controlled door closing devices under
**EN 1154**. Fire and life safety, including where fire doors are required, under
**NBC 2016, Part 4**. The rating, type and hardware for each door must be
confirmed by the project's fire consultant and the authority having
jurisdiction.

## Frequently asked questions

### Is a fire-rated door just a stronger door leaf?

No. The rating belongs to the doorset that was tested: leaf, frame, hinges, closer, lock, intumescent and smoke seals, vision panel and the way it was fixed into the wall. A rated leaf hung in an unrated frame with ordinary hinges is an untested assembly. Ask for the test or assessment report for the complete doorset, not a certificate for the leaf.

### What is the difference between integrity and insulation on a fire door?

Integrity means the door stopped flames and hot gases passing through or around it for the tested time. Insulation means it also kept the temperature on the unexposed face below the test's limit. Under EN 13501-2 these appear as E (integrity) and EI (insulation) followed by minutes. A door can have an integrity rating without an insulation rating. Which a given opening needs is set by the fire consultant.

### How many minutes of fire rating does my door need?

That depends on the wall the door sits in, the building's use and height, and the fire strategy. It is decided by the fire consultant under NBC 2016 Part 4 and the authority having jurisdiction, not by the door supplier. The door's rating should match what the fire strategy assigns to that wall.

### Can we add a vision panel or change the lock on an existing fire door?

Only within the manufacturer's test evidence. Cutting a vision panel, fitting a different lock, adding a letter plate or kick plate, or planing the leaf all change the tested assembly. Any change should be checked against the test or assessment report and done with components it covers, or the door should be replaced with a doorset tested in the new configuration.

### Why do fire doors have closers, and can they be propped open?

A fire door only works when shut, so a self-closing device is part of the tested doorset. Propping it open with a wedge defeats it. Where doors must stay open in normal use, hold-open devices that release on a fire alarm signal are used, linked to the fire detection system. Whether that is acceptable on a particular door is for the fire consultant.

### How often should fire doors be inspected?

Regularly, as part of the building's fire safety maintenance, and after any work near them. Checks cover whether the door closes and latches fully from any angle, gaps around the leaf, condition of seals, hinges and closer, damage to the leaf, and the label. The facility's fire safety plan sets the frequency.

## Sources

- [IS 3614:2021](https://standards.bis.gov.in/website/published-standards/department-wise) — Fire doors and doorsets — specification
- [IS 17518 (Part 1)](https://standards.bis.gov.in/website/published-standards/department-wise) — Fire resistance tests — door and shutter assemblies — general requirements (adoption of ISO 3008-1)
- [EN 1634-1](https://standards.cencenelec.eu/ords/f?p=CEN:105) — Fire resistance and smoke control tests for door and shutter assemblies, openable windows and elements of building hardware — fire resistance test
- [EN 13501-2](https://standards.cencenelec.eu/ords/f?p=CEN:105) — Fire classification of construction products and building elements — classification using data from fire resistance tests
- [BS 476-22](https://knowledge.bsigroup.com/) — Methods for determination of the fire resistance of non-loadbearing elements of construction
- [UL 10C](https://www.shopulstandards.com/) — Positive pressure fire tests of door assemblies
- [EN 1154](https://standards.cencenelec.eu/ords/f?p=CEN:105) — Building hardware — controlled door closing devices — requirements and test methods
- [NBC 2016, Part 4](https://www.bis.gov.in/standards/national-building-code/) — Fire and life safety

---

Source: https://hagerstone.com/materials/fire-rated-door