(a) When provided, a separate head injury unit shall comply with section 4.2-2.2, "Resident Unit" of part 4, "Residential Health Care Facilities," of Guidelines for Design and Construction of Health Care Facilities, 2010 edition, as described in more detail in section 711.2(b)(7) of this Title, and with the following variations and additional requirements:

1. (1) A minimum of 20 percent of the total residents in a unit shall be in single rooms.
2. (2) The minimum room areas exclusive of toilet rooms, closets, wardrobes, alcoves or vestibules shall provide adequate space for special needs and equipment for each resident.
3. (3) The resident rooms shall be provided with room furnishings and equipment required for continuing unscheduled therapeutic program activities.