Section 1 - Receiving
1.1 Unpacking List
Included with the installation/operation manual are four
identification index buttons. These buttons may be used to iden-
tify the type of service supplied to the service valves. Also
included in a separate bag is the drain valve. Attached to the
valve is a small Allen wrench used for calibrating the Static
Pressure Gauge. This Allen wrench should be kept with the
manual at all times.
Section 2 - Introduction
2.1 Description
The Models 1284, 1285, 1286 and 1287 are Class II, Type
A2 cabinets. The “Type A2” designation indicates two alterna-
tive uses of the cabinet. The unit may be vented directly into
the laboratory room or vented to the outside atmosphere,
through an in-house exhaust system. Either usage of the cabinet
offers both personnel and product protection.
The cabinet can be used in low-to-moderate risk environ-
ments and is designed to NSF, International Standard #49. Class
1, 2, and 3 (low-to-moderate risk) agents are described in the
“Biosafety In Microbiological And Biomedical Laboratories”;
CDC NIH Publication No. (NIH) 88-8395, 4th Edition, May
1999.
The cabinet’s window permits the user to place auxiliary
equipment and research implements in the work area. The work
opening must be held to 10 inches during all work procedures.
If the window is raised higher than the designated 10 inches,
the air barrier at the front of the cabinet will be weakened and
containment will be seriously impaired.
2.2 Theory of Operation
Clean, filtered air descends through the work zone with
approximately 40% being discharged through the exhaust
HEPA filter with the remaining air recirculating through the
supply HEPA filter into the work area. Exhausted air is replaced
by room air entering the system through the front access open-
ing.
Room air entering the work zone, through the front access
opening, completes the air barrier at the unit face and is respon-
sible for the containment properties of the unit. All work must
be performed beyond the intake grille, on the solid work tray.
Class II, A2 Biological Safety Cabinets______________________________________________________________Introduction
2 - 1
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