06-06
3.4 EXHAUST AIR SYSTEMS
A. GENERAL: The following guidelines shall be used for designing the
exhaust systems for the animal research facilities.
1. As far as possible, each air handling unit shall have its own
dedicated general exhaust fan system, interlocked with the supply
air unit, to ensure proper air balance and control.
The general
exhaust system, whether from the animal research area or support
areas, shall include exhaust air from the janitor closets, storage
areas, soiled areas, and qualifying electrical/telephone closets.
2. All air from the animal research areas shall be exhausted outdoor
from the highest roof level of the building with the discharge
velocity of 1530 m/s (3,000 fpm).
Recirculation of the room air
within the space, or between the spaces, is not permitted.
The
designer shall ensure the exhaust air does not contaminate the
intake air to the air handling units of the research facility or
the surrounding buildings.
3. For fume hoods, dedicated exhaust systems shall be provided.
The
specific requirements of these systems depend upon the type of
hoods(s).
4. To handle generally saturated and moist air from the cage washing
area, a dedicated "wet exhaust" system shall be provided.
5. Air from the animal holding room shall be exhausted at the floor
level with the bottom of the exhaust intake at six inches above
the floor level.
If possible, exhaust shall be picked from all
four corners of the room.
If this is not feasible, the air shall
be exhausted from two diametrically opposite sides of the room.
The exhaust air shall be filtered by providing a throw-away type
of economical air filter, with cardboard frame, at each air
intake.
The filter shall easily slip into a surface mounted
stainless steel frame to facilitate observation and timely change
of the filters, the surface of the filters shall be exposed (that
is, without any cover) to rooms.
6. See Article 6 for the heat recovery criteria for the exhaust air.
B. FUME HOOD EXHAUST SYSTEMS:
1. General: Depending upon the type of hood and/or biological safety
cabinet dedicated exhaust systems shall be provided as shown below.
The following considerations apply to each fume hood exhaust system.
a. The ventilation system for the fume hood exhaust shall conform to
the OSHA (Occupational Safety and Health Act), Regulation 29 CFR,
Part 1910.
The exhaust shall be continuously monitored and an
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