(a) General. When mobile, transportable and relocatable units are utilized to provide patient treatment services on the facility premises, these units shall be treated as buildings and constructed to the required occupancy as follows:      
        (1) When such units are provided for diagnostic, treatment or procedural services to patients that are litter borne or incapable of self-preservation, the unit shall be constructed in accordance with Chapter 18 of the National Fire Protection Association 101, Code for Safety to Life from Fire in Buildings and Structures, 2000 edition (NFPA 101), relating to health care occupancy, published by the National Fire Protection Association. All documents published by the NFPA as referenced in this section may be obtained by   writing or calling the NFPA at the following address and telephone number: Post Office Box 9101, 1 Batterymarch Park, Quincy, Massachusetts 02269-9101, (800) 344-3555.       
        (2) When such units provide diagnostic, treatment, or procedural services to patients, or types of services that are not litter borne and are capable of self-preservation, the unit may be constructed in accordance with Chapter 38 of NFPA 101 (relating to Business Occupancy).       
      (b) Common elements.      
        (1) Site requirements.                  (A) Sites shall be designed for the structural loads of the unit.                   (B) The sites shall provide hazard-free drop-off zones and adequate parking for patients. The site and location of the  unit  shall not restrict access for fire or emergency vehicles.                   (C) Each site shall provide access to the unit for the handicapped, and wheelchair and stretcher patients.                   (D) The location of the unit shall be such that engine exhaust fumes from the unit are kept away from any fresh air intake of the facility.                   (E) Each unit shall be provided with approved fire alarm connections. Properly sized power, including emergency power, water, waste, and telephone services shall be provided as necessary.         
        (2) Support services. Support services such as waiting areas, toilet facilities, and storage spaces shall be provided either within the unit or located within the facility adjacent to the  site  unit for convenient use.       
     Source Note:        The provisions of this §510.126 adopted to be effective January 1, 2004, 28 TexReg 5154; transferred effective June 1, 2019, as published in the Texas Register May 17, 2019, 44 TexReg 2469