To exempt travel distance measurement involving a suite or room from the application of Sentence 3.4.2.4.(1), which would otherwise require the measurement from the furthest point in the suite or room, and permit measurement from the egress door of the suite or room, if certain conditions are met.
This is on the basis that the portion of the travel route outside the room or suite is protected from a fire in the rooms or suites leading onto the protected egress route and thus would not be rendered untenable within the time required to achieve occupant safety.