06-06
C. WET EXHAUST SYSTEMS:
1. General:
The exhaust air from the cage sanitation area shall be
picked up by a dedicated exhaust system and mainly through the canopy
type of hoods over the cage and rack washer(s), tunnel washer(s), and
autoclave(s).
2. Exhaust ducts shall be corrosion resistant.
The duct material shall
be either high grade 316 stainless steel with welded joints, or
plastic, or plastic lined.
The horizontal runs must be leak proof
(flanged and gasketed joints are not satisfactory) and fitted with a
gravity drain to remove condensed moisture.
3. The exhaust fan motor shall be kept out of the air stream.
4. The exhaust air volume shall be based on the requirements of the
sanitation equipment and the size(s) of the canopy hoods through
which a face velocity of 30 m (100 feet) per minute shall be
maintained.
When cage washer door(s) are open (get signal from
washer control panel) air shall be exhausted from the washer (125 Pa)
(0.5 inch Water Gage - WG. static pressure drop).
The same air shall
be exhausted through canopy hood(s) when the washer doors are closed.
To implement the changeover, a set of motorized dampers shall be
provided between the washer inlet and canopy hood with only one
damper open at any given time.
An air flow control valve shall be
provided in the exhaust air duct to ensure the same air volume
through each circuit.
3.5 TEMPERATURE CONTROL CRITERIA
A. GENERAL:
The temperature controls system shall be direct digital
(DDC) type with pneumatic and/or electronic operators for the
dampers, valves, and air terminal units.
The DDC controls of the
animal research facilities shall be connected to the engineering
control center (ECC) if the facility has any such central control
center, and if such tie-in is technically feasible.
Alternately, a
dedicated ECC shall be provided for the ease of remote control and
monitoring of the animal research controls.
B. SPECIAL CONSIDERATIONS:
1. Monitoring:
An automatic monitor and alarm system for monitoring
the space temperature (high and low) and humidity shall be
provided for each animal room and/or cubical.
Note the following
guidelines:
a. The monitoring at local level shall be done by providing a
dedicated panel with visible (light) and audible (bell with reset)
capabilities.
The monitoring at central level shall be done
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