(a) Client rooms shall not be locked when occupied unless the client has the means to easily unlock the door.

(b) Only upon the written approval of the Department may an exit door, corridor door, yard enclosure or perimeter fence be locked to egress.

(c) Rooms approved by the State Fire Marshal, or designee for ambulatory clients only shall not accommodate nonambulatory clients; however, this does not prohibit the mixing of ambulatory and nonambulatory clients according to their developmental needs, so long as such room assignment is consistent with the fire clearance.