Fire Door Ratings and Classified Openings

90 Minute Fire-Rated Door
w/ Narrow Vision Lite on KD Drywall Frame – Finished (Painting by others)

3 Hour Fire-Rated Door
Flush Door on Welded Masonry Frame – Unfinished (Primed Gray)

Fire door openings are classified by their locations in a building.
Location determines the length of exposure protection required, based on the potential fire hazard of that particular area. The opening
classifications are shown below. Fire-protection ratings tested and
classified by: Warnock Hersey-WHI or Underwriters Laboratories- UL. The local Authority Having Jurisdiction must be the final authority on fire door assembly issues.

Note: Most exterior doors do not require fire rating, unless there is the potential for fire exposure from the outside of the building.

Fire Label
Door Rating
 Wall Rating Description and Use
Trudoor 3 Hour Fire Label
3 Hour (180 Minutes)
 4 Hour These openings are in wall that separate buildings or divide a single building into designated fire areas.
Trudoor 90 Minute Fire Label
1-1/2 Hour (90 Minutes)
 2 Hour Openings of this type are used in enclosures of vertical communication or egress through buildings. Examples include stairwells and elevator shafts. They also occur in boiler rooms and in exterior walls that have the potential for severe fire exposure from the outside of the building.
Trudoor 60 Minute Fire Label
1 Hour (60 Minutes)
 1 Hour These door and frame assemblies divide occupancies in a building.
Trudoor 45 Minute Fire Label
3/4 Hour (45 Minutes)
 1 Hour For use where there are openings in corridors or room partitions. A door with this rating may also be located in the exterior wall of a building subject to moderate fire exposure from the outside of the building.
Trudoor 20 Minute Fire Label
1/3 Hour (20 Minutes)
 1 Hour These openings are in corridors where smoke and draft control is required.

Five Basic Requirements for a Fire-Rated Opening

The wall, door frame, door and hardware must all be fire rated.
The door must be self-closing and positive latching (push/pull plates
cannot be used on a fire rated door) and UL approved hinges must be
used.

  1. Labeled Door Frame
  2. Labeled Door
  3. Approved Closing Device (Door Closer or Spring Hinges; Spring Hinges for Doors up to 3’0″ x 7’0″ only)
  4. Approved Latching Device (Lockset or Exit Device)
  5. Steel Ball Bearing Hinges (or UL Labeled Continuous Hinge)