(a) Patients shall be accommodated only in rooms with the following minimum floor area:

(b) Each patient room shall be labeled with a number, letter or combination of the two for identification.

(c) Patient rooms which are approved for ambulatory patients only shall not accommodate nonambulatory patients. Before patients are accommodated in ambulatory sections, they shall demonstrate that they are ambulatory, and this shall be noted in the patient's medical record. The hospital shall transfer patients from the ambulatory section when their condition becomes nonambulatory. The ambulatory status of patients shall be demonstrated upon request of the Department.

(d) Patient rooms approved for use by ambulatory patients only shall be identified as follows: the words Reserved for Ambulatory Patients, in letters at least one and one-half centimeters (one-half inch) high shall be posted on the outside of the door or on the wall alongside the door where they are visible to persons entering the room.

(e) Except in rooms approved by the Department for detention and for psychiatric patients, patients' rooms shall not be kept locked when occupied.

(f) Any exit door, corridor or perimeter fence may be locked for egress only upon the written approval of the Department.