Forma Scientific, Inc.________________________________________________Installation
3-2
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
• Locate the exhaust filter guard on the top of the cabinet.
• Remove and save the ten acorn-type nuts and washers that secure the exhaust filter
guard.
• Remove the cardboard cover plate from the top of the cabinet.
• 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 B
3
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 Forma Scientific,
Inc. The exhaust transition 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 biological safety officer or
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
atmosphere.
The exhaust system must be capable of handling the volume 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.
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