patient develops any additional disease(s), such as, tuberculosis, then
confinement of the patient in negative pressure isolation room is
necessary and the isolation room criteria for air changes and pressure
relationship would apply. And if the patient is vulnerable to
infectious disease, a positive pressure isolation room will be
necessary. The decision regarding the number, location(s), and type of
isolation rooms shall be the responsibility of the VA.
(c) See Article 3.21 for Surgery Suite System for the OR HVAC systems.
(d) The minimum supply air quantities for VAV systems shall not be less
than the exhaust air requirements, if any.
(e) The supply air quantity for the corridors could be greater than
four air changes per hour if this air is to be used as make-up air for
exhaust needs of the adjoining areas, such as Toilets, Janitor Closets,
Soiled Utilities Rooms, Locker Rooms, etc.
(f) Provide non-aspirating type supply air diffuser in Isolation Rooms.
1.3.5 OUTDOOR AIR REQUIREMENTS (Mechanical Cooling)
1.3.5.1 100 PERCENT OUTDOOR AIR AREAS:
(a) Animal Research Areas
(b) Autopsy Suites
(c) BMT Patient Areas
(d) Complete SPD Departments (Complete Suite)
(e) Laboratories
(f) Surgery Suites
1.3.5.2 NON-100 PERCENT OUTDOOR AREAS
(a) Base minimum outdoor air, in accordance with ASHRAE Standard 62-
1999, and with additional specific requirements as listed in Table 1-3.
(b) For the patient bedrooms, except for Intensive Care Units and
offices, any one of the following HVAC systems can be used.
(1) Terminal heating and cooling units, such as fan coil units or
radiant ceiling panels.
(2) All air systems with minimum outdoor air quantities noted in Table
1-3. Re-circulation of air will be permitted.
(3) The amount of outdoor air and how it is supplied to the occupied
spaces would depend upon the type of HVAC system used.
(c) When the fan coil units or radiant ceiling panels are used, a
central ventilation unit supplies conditioned air to the spaces. With
this arrangement, the source of outdoor air being external to the
principle cooling and heating equipment, it is possible to ensure the
HVAC DESIGN MANUAL
1-10
GENERAL REQUIREMENTS
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