Basic Documentation

Healthcare Facilities
Room Pressure Monitors
Room pressure monitors are provided for both the patient room and the anteroom. This
ensures that proper room pressurization for both rooms can be constantly monitored and
verified. It is also important that both the anteroom and the patient room controllers be
located outside of the rooms so that access to these devices does not require service
personnel to enter either the anteroom or patient room.
Protective Isolation Room Layout
Figure 8 shows an optimum room airflow and control arrangement for a protective isolation
room. The room layout consists of the patient room and an anteroom to provide added
assurance against airflow entering the patient room from adjoining areas. The airflow control
arrangement maintains the patient room positive with respect to the anteroom and the
adjacent corridor.
ROOM
CONTROLLER
ANTEROOM
ROOM
PRESSURE
MONITOR
SUPPLY
TRANSFER
AIRFLOW
DOOR DOOR
+
CFM
CFM
PATIENT ROOM
LAB0199R1
Figure 8. Protective Isolation Room.
Ventilation and Control System Application
Room supply air is HEPA filtered and the room ventilation airflow is arranged to first pass
over the patient and then proceed toward the room exhaust grill. As an option, the anteroom
may be equipped with an exhaust provision so that the anteroom is negative with respect to
the corridor, while the patient room remains positive with respect to the anteroom and
corridor. Such an arrangement provides maximum protection for the patient even when
others are present in the room. Since the patient is directly exposed to the incoming supply
airflow, the supply air diffuser and airflow velocity must be carefully chosen to not create an
uncomfortable draft for the patient.
Siemens Building Technologies, Inc. 29