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The general objectives were to determine the adequacy of AIIRs, provide guidance for construction or conversion of existing patient rooms into AIIRs, provide technical assistance on ventilation and other controls (e.g., isolation, procedures, and training), evaluate appropriate use of personal protective equipment, and provide guidance on various environmental considerations for infection control.
Meetings were held with facilities and ventilation engineers, hospital administrators, and medical and nursing staff to understand the number, type, and location of AIIRs. Mechanical drawings, blueprints, and ventilation testing reports were reviewed, and walkthrough surveys were conducted.
One proposal considered configuring arrays of shipping containers (widely available in this port city) into patient AIIRs linked in hub-and-spoke fashion by a central nurses' station.
This facility was dedicated on May 28, 2003, substantially increasing the number of AIIRs available in southern Taiwan.
The ceiling air supply diffusers used in the mock AIIR are shown in Figure 2.
The supply diffusers for the mock AIIR are selected to provide minimum ventilation rates and indoor air quality that is acceptable to the patient and HCW as per ANSI/ASHRAE/ ASHE Standard 170 (ASHRAE 2013).
The fresh air inflow of 148.16 cfm (251.72 [m.sup.3]/h) into the AIIR is caused by the airflow from the main supply (the linear inlet diffuser inflow rate is 81.49 cfm [138.45 [m.sup.3]/h] and the square supply inflow rate is 66.67 cfm [113.27 [m.sup.3]/h]) and the outflow of 225 cfm (382.27 [m.sup.3]/h) is due to the airflow through the main exhaust and the leakage into the bathroom.
(-2.49 Pa) was specified as the boundary condition at the gaps around the AIIR's main entry door.
For the AIIR, the measured velocities were specified at the gaps around the main door.
For Case 1, like the AIIR, 40% of the bathroom exhaust flow rate was specified as the flow from the main room into the bathroom.
The cough event (one instance of patient cough) in both the AIIR and the traditional patient room was modeled using data from the literature.
Figure 4 shows the pathlines of the flow in the AIIR. The air jets issue from the main supply on the ceiling at an angle of 45[degrees] to the ceiling.
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- Aijeleth Shahar