3 - 1
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.
3.2 Power Connection
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 dedicated cir-
cuit. Refer to Section 9 or to the serial plate on the front of the
unit for electrical specifications.
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. An
additional two service valves may be purchased from Thermo
Forma.
Explosive/flammable substances should never be
used in the cabinet, unless approved and moni-
tored by a biological safety officer or other quali-
fied individual. However, if flammable gas is
used, emergency shut-off valves must be located
in an accessible area external to the cabinet.
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.
a. Direct Room Exhaust
1. Locate the exhaust filter guard on the top of the cabinet.
2. Remove and save the ten acorn-type nuts and washers
that secure the exhaust the exhaust filter guard.
3. Remove the cardboard cover plate from the top of the
cabinet.
4. Replace the exhaust filter guard with the slope toward
the front and the back of the unit. Secure it with the ten
acorn-type nuts and washers removed earlier.
b. External Exhaust System (For Class II Type B3
Only)
The intermediate connection of the cabinet to any external
exhaust system (in-house) can be done by using an exhaust
transition, which is available from Thermo Forma. The exhaust
transistion requires a minimum of 17-1/8” headroom from the
top of the cabinet.
The exhaust system should have safeguards
against exhaust failure. It is required that a bio-
logical safety officer, industrial hygienist or other
qualified individual review the agents and chemi-
cals used inside the cabinet to determine if addi-
tional filtration treatment is necessary before vent-
ing to the atmosphere.
The exhaust system must be capable of handling the vol-
ume of air passing through the cabinet. Models 1284, 1285 and
1288 have an air volume of 356-390 CFM. Models 1286, 1287,
1290 and 1291 have an air volume of 530-581 CFM.
Model 1280/1290 Series _________________________________________________________________________Installation
