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
1. Locate the exhaust filter guard on the top of the cabinet.
2. Remove and save the four acorn-type nuts and washers that secure 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 four acorn-type nuts and washers removed in Step #2.
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 accomplished using an exhaust transition available from Forma Scientific, Inc. The exhaust
transition requires a minimum of 16-1/2" headroom from the top of the cabinet.
CAUTION! 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.
Exhaust requirements are:
Models 1184, 1185, 1188, 1194, 1195: 339-369 CFM
Models 1186 and 1190: 505-556 CFM
Model 1196: 510-561 CFM
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