(a) The hospital space required under § 108.209 is not required on a unit if one single or double occupancy sleeping space, designated and equipped as a treatment or isolation room or both is available for immediate medical use, and has—

1. (1) An entrance that is wide enough and arranged to readily admit a person on a stretcher;
2. (2) A single berth or examination table that is accessible from both sides; and
3. (3) A washbasin in or immediately adjacent to it.