(2) The summer indoor design relative humidity shown above need not be
maintained by any humidity control, either at the air terminal units or at
the air handing units. These values merely represent design reference
points and, in actual practice, would vary due to the predetermined air
quantities and fluctuations in the internal heat loads. The winter indoor
design relative humidity shall be maintained by a humidifier either at the
air terminal unit or at the air handling unit, or both.
(3) Depending upon the weather conditions, winter humidification may be
deleted from the air-handling unit serving non-patient areas. The decision
to do so, however, shall be reviewed with and approved by the VA.
(4) Bathrooms and toilets do not require individual room temperature
control in the cooling mode. Provide a terminal heating device and space
temperature control in heating mode for exterior bathrooms/toilets.
(5) The following areas are designated as "TB Treatment Rooms" for the
purpose of this criteria. They typically are spaces where procedures are
performed and/or treatments are administered to the S/KI TB patients.
(a) Diagnostic Sputum Induction.
(b) Administration of Aerosolized Pentamidine (AP) Drug. This also
includes other aerosol treatments, cough-inducing procedures, or aerosol-
generating procedures.
(c) Bronchoscopy.
3.22.4.2 See Table 3-6 for supply air requirements:
Table 3-6 TB Criteria Supply Air Requirements
ROOM OR AREA
MINIMUM AIR
CHANGES PER HOUR
Ante Rooms (recommended but not
12
required for AFB Isolation Rooms)
Emergency Care Areas
12
Treatment Rooms
12
ICU AFB Isolation Rooms*
12
TB Dental Operatory
12
TB Dialysis Rooms
12
Isolation Rooms for treatment of S/KI
12
TB patients
TB Radiology Rooms (One Required)
12
Clinical Mycobacterial Laboratories
12
* Air changes/hour should include at least two outdoor air changes per
hour.
HVAC DESIGN MANUAL
3-26
HVAC REQUIREMENTS FOR OCCUPIED AREAS
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