Fire-Rated Doors: Ratings, Requirements & How to Choose the Right One

What Is a Fire-Rated Door?

A fire-rated door is a door assembly tested and certified to resist the passage of fire and smoke for a specified period of time. In commercial construction, fire-rated doors are required by building codes in specific locations to protect egress paths and compartmentalize fire spread.

Fire Door Ratings Explained

Fire doors are rated by the amount of time they can withstand fire exposure during a standardized test:

• 20-minute rating: Used in corridor and room partitions with a 1-hour wall rating.
• 45-minute rating: Required in 1-hour fire-rated corridors and room separations.
• 60-minute (1-hour) rating: Used in 2-hour fire-rated walls.
• 90-minute (1.5-hour) rating: Required in 2-hour fire-rated walls in certain occupancies.
• 3-hour rating: Used in fire walls and occupancy separations with a 4-hour wall rating.

Where Are Fire-Rated Doors Required?

Building codes (IBC, NFPA 80) require fire-rated doors in:

• Stairwell enclosures
• Elevator lobbies
• Mechanical and electrical rooms
• Corridors in healthcare, educational, and assembly occupancies
• Openings in fire walls and fire barriers

Key Components of a Fire Door Assembly

A compliant fire door assembly includes more than just the door itself:

• The door (labeled and listed)
• The frame (must also be fire-rated)
• Hardware (hinges, closers, latches — all must be fire-rated)
• Glazing (if vision lites are included)

How to Choose the Right Fire-Rated Door

1. Identify the required rating from your architect or AHJ (Authority Having Jurisdiction).
2. Confirm the wall assembly rating — the door rating must match.
3. Select the appropriate door size and swing direction.
4. Ensure all hardware is listed for use with the door assembly.
5. Verify the door carries a UL or Intertek label.