(a) An existing large Type B assisted living facility must meet the requirements of 19.2, Means of Egress, in NFPA 101, Chapter 19, Existing Health Care Occupancies, except as described in this section.(b) An existing large Type B assisted living facility must ensure doors meet the requirements of 19.2.2.2, Doors, in NFPA 101, Chapter 19, Existing Health Care Occupancies, and the additional requirements of this section.(1) A resident room door in an existing large Type B assisted living facility must latch in its frame to resist the passage of smoke.(2) In an existing large Type B assisted living facility comprised of buildings containing living units, with independent cooking equipment within the living unit, a door between the living unit and a corridor or hallway must:(A) be self-closing or automatic-closing; and(B) latch in its frame to resist the passage of smoke.(3) A resident room door or living unit door must not be arranged to prevent the occupant from closing the door.(c) An existing large Type B assisted living facility providing spaces for use by residents on floors other than the ground floor must provide at least two separate approved stairs and must ensure stairs used as a means of egress meet the requirements of 19.2.2.3, Stairs, in NFPA 101, Chapter 19, Existing Health Care Occupancies.(d) An existing large Type B assisted living facility must ensure means of egress are marked according to the requirements of 19.2.10, Marking of Means of Egress, in NFPA 101, Chapter 19, Existing Health Care Occupancies.(e) An existing large Type B assisted living facility must provide emergency lighting according to the requirements of 19.2.9, Emergency Lighting, in NFPA 101, Chapter 19, Existing Health Care Occupancies.