Assertion: stairwell | /r/HasProperty | primary escape route
Facets:
value: frequently
type: TEMPORAL
Source sentences:
text: Stairwells are frequently the primary escape route in the event of a fire emergency and may also serve as the primary access route for firefighting teams.
text: Stairwells, the primary means of escape during a fire, must be designed so the stairwell's pressure is higher than that of the rest of the building.