What is a Fire-Rated Steel Door? A Complete Guide for Indian Projects
A fire-rated steel door is a tested door assembly engineered to resist the spread of fire and smoke for a specified duration — most commonly 30, 60, 90 or 120 minutes. In Indian buildings, fire-rated steel doors are a core part of life-safety design: they protect evacuation routes, compartmentalize floors, and buy occupants the time they need to exit safely.
How a fire-rated steel door works
Unlike a regular door, a fire-rated steel door is engineered as a complete assembly: shutter, frame, hinges, lockset, closer, smoke seals and (optionally) a vision panel. Each part is selected so that the assembly continues to perform under heat.
The door leaf is built from cold-rolled or galvanized steel sheet, filled with a mineral-fibre or rockwool core that resists heat transfer. Around the edges, intumescent strips expand when temperature rises and seal the gap between leaf and frame, blocking flame and hot gases.
Understanding fire ratings (30, 60, 90, 120 minutes)
The number of minutes refers to the assembly's tested integrity rating — how long it kept fire and hot gases on one side during a furnace test. A 60-minute door is typically used between corridors and stairwells, while 90 or 120-minute doors protect critical compartments such as electrical rooms, server rooms and high-rise lift lobbies.
Always specify the rating that matches the wall around the door. A 120-minute door installed in a 60-minute wall delivers no more than 60 minutes of compartmentation.
Where fire-rated steel doors are required in India
The National Building Code (NBC 2016, Part 4 — Fire & Life Safety) and state fire-NOC requirements call for fire-rated doors at evacuation staircases, refuge areas, lift lobbies in high-rises, electrical rooms, AHU rooms, transformer rooms, basements and many other locations.
Hospitals, hotels, malls, IT parks, industrial plants, data centers and government buildings all rely heavily on rated steel doors as part of their fire-NOC documentation.
What to specify in a fire-door BOQ
A complete BOQ line for a fire-rated steel door usually includes: door type (single or double leaf), exact size, fire rating in minutes, frame type, shutter construction, finish (powder-coated RAL shade), vision panel, hardware set (hinges, closer, lockset, panic device) and smoke seals.
Sharing project drawings or a door schedule with these fields filled in helps the manufacturer offer the right product and price quickly. You can submit your BOQ to Acodor in seconds.
Frequently Asked Questions
Is a fire-rated steel door the same as a fire-resisting door?
Yes. The terms 'fire-rated', 'fire-resisting' and 'fire door' are used interchangeably for tested door assemblies that hold back fire and smoke for a specified period.
Which fire rating do I need — 60, 90 or 120 minutes?
It depends on the wall the door sits in and the building code requirement. Evacuation staircases in many high-rises require 90 or 120 minutes, while internal compartments are often 60 minutes. Always match the door rating to the surrounding wall rating.
Can a fire-rated door have a glass vision panel?
Yes — vision panels must use certified fire-rated glazing matched to the door's rating, installed with the correct beading and intumescent material.
Do fire-rated steel doors need a door closer?
Yes. A fire door is only effective when closed, so an automatic overhead door closer (or hold-open device released on alarm) is mandatory.