Section 3 - Installation
3.1 Location
Locate the cabinet on a firm, level surface in an area of
minimum temperature changes. The cabinet should be placed
away from disruptive air currents caused by excessive person-
nel traffic, air-conditioning or heating ductwork, or laboratory
windows and doors. Proper cabinet location is important, as
drafts disrupt critical airflow characteristics and allow room
contaminants to enter or escape the cabinet work area.
Where space permits, fourteen inches should be allowed on
each side of the cabinet for maintenance. A twelve-inch height
should be available from the top of the cabinet to the ceiling.
Place a bubble-type level on the work surface. Adjust the
leveling feet until the cabinet is level and the most comfortable
working height is achieved. Ensure that all four leveling feet
are fully flush against the floor to prevent vibration.
Model 1284/1285 weighs 735 lbs. Model 1286/
1287 weighs 940 lbs. Have sufficient personnel to
lift it.
3.2 Power Connection
The power switch is located on the front, right-side of the
cabinet. The power switch is also a circuit breaker that protects
the unit. The electrical wall outlet leading to the cabinet should
be accessible for electrical testing.
This cabinet is equipped with one power cord supplying
power to the blower, lights and receptacles. The cord should be
plugged into a grounded, dedicated circuit. Refer to Section 11
- Specifications or to the serial plate on the front of the unit for
electrical specifications. With the power switch turned off, plug
the line cord into the wall outlet.
3.3 Plumbing Connection
Two service valves are standard with each cabinet and
located on the right and left side of the work station. All service
valves are piped within the cabinet. External connection is a
3/8” FPT coupling. Identification index buttons are supplied.
The cabinet will accommodate four service valves. Two
additional service valves are available.
Explosive/flammable substances should never be used in the
cabinet, unless approved and monitored by a biological safety
officer or other qualified individual. However, if flammable
gas is used, emergency shut-off valves must be located in an
accessible area external to the cabinet.
a. Universal Plumbing Option
The Universal Plumbing option is factory installed.
External connection (1/4” NPT) to the unit is available on the
top and the underside of the cabinet, as well as the standard
side connection. See Figure 3-1.
3.4 Exhaust Requirements
Filtered air from the cabinet may be exhausted directly into
the room or vented to the outside through an external exhaust
system. Consult a biological safety officer or other qualified
individual for cabinet-type exhaust requirements. Refer to NSF
Standard, NSF 49-2002, Annex E.
a. Direct Room Exhaust
A cardboard cover plate is shipped under the exhaust filter
guard. It must be removed before the unit is placed into service.
Locate the exhaust filter guard on the top of the cabinet.
Remove the guard and discard the cardboard. Secure the
exhaust filter guard as previously.
b. External Exhaust System (For Class II Type A2)
If an external exhaust system is needed, use a canopy
(thimble) connection (Figure 3-2). When the cabinet is certi-
fied, check the opening in the canopy to ensure inward airflow,
using a smoke stick. Ensure proper air balance at the front
access opening for adequate containment. Verify that the build-
ing exhaust system is sized to exhaust 30% more air than the
cabinet exhausts. Models 1284 and 1285 exhaust an air volume
of 356-390 CFM. Models 1286 and 1287 exhaust an air volume
of 530-581 CFM.
IMPORTANT! The exhaust air must be drawn
from the cabinet through a dedicated exhaust sys-
tem (only one BSC per exhaust system). The
exhaust system may be connected to the collar
(optional exhaust transition) located on the top of
the unit.
The exhaust system should have safeguards against exhaust
failure. It is required that a biological safety officer, industrial
hygienist or other qualified individual review the agents and
chemicals used inside the cabinet to determine if additional
filtration treatment is necessary before venting to the atmos-
phere.
Model 1280 Series _________________________________________________________________________Installation
3 - 1
