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of the supply air is done on the basis of the cooling load
requirements, the spaces with greater cooling requirements
will, naturally, receive more outdoor air. It is, thus,
recognized that the uniform distribution of outdoor air is
inherently difficult with an all air system.
3. Terminal Cooling/Heating System: When the fan coil units or
radiant panels are used, a central ventilation unit shall
supply conditioned air to the spaces.
With this arrangement,
the source of outdoor air being external to the principal
cooling and heating equipment, it is possible to ensure
predetermined and exact amount of outdoor air distribution to
all spaces.
2.5 EXHAUST AIR REQUIREMENTS
The following areas shall be fully exhausted outdoors at the rates
specified:
TABLE 2.3
Animal Research Areas
Supply air + 15%
------------------------------------------------
Janitor Closets
10 Air Changes/Hr.
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Locker Rooms
10 Air Changes/Hr.
------------------------------------------------
Mechanical Equipment Rooms
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Soiled Storage Spaces
6 Air Changes/Hr.
------------------------------------------------
Toilets
10 Air Changes/Hr.
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Notes:
1.
Since all animal research areas are to be maintained under
negative pressure, the exhaust air volume from these spaces
shall be 15% more than the supply air volume. This difference
in air volumes shall come from corridors whose supply air
volume shall be fixed on the basis of the make up air
requirements of all connected spaces.
If the space layout of the animal holding areas is such that
there are two corridors, clean and soiled, the relative air
pressure in the clean corridor shall be positive with respect
to the animal holding areas. The soiled corridor shall be
negative with respect to the animal holding areas. The
direction of air flow shall be from clean corridors to animal
holding areas to soiled corridors.
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