Building Fire Safety: Exits, Means of Egress, and Travel Distance
The egress system
Means of egress runs from the suite or room, through corridors and exit stairs, to the exterior. Requirements address number of exits, width, travel distance, dead-end limits, and continuity of the path. Two exits are generally required where occupant load or travel distance exceeds thresholds, and exits must be remote from each other so a single event cannot block both.
Travel distance and suites
Travel distance is measured along the path of travel to an exit, not in a straight line. Suite and room provisions allow a single exit in some small or sprinklered spaces. Corridor ratings, door swing, and egress width depend on occupant load.
Traps
- Measuring travel distance as straight-line distance through walls.
- Forgetting that exit remoteness is a separate requirement from the number of exits.
- Ignoring that egress width depends on occupant load and may need to increase.
- Overlooking that doors must swing in the direction of travel in many high-occupancy cases.
- Assuming sprinklers eliminate the need for two exits; they may relax but not erase the requirement.
Rule of thumb
Count exits, check remoteness, then measure the true path. Worked example: a room with a long, winding aisle may exceed the travel distance limit even though the straight-line distance to the door looks short; the path along the aisle is what counts, and if the limit is exceeded a second remote exit is needed.
Exam approach
For egress questions, establish occupant load first, then number and remoteness of exits, then travel distance, then width and door swing.