The Fundementals of Smoke Control
Andover Controls Corporation 1-7
TOC
A smoke control system may also have to be designed to work with
gas-based fire extinguishers, such as the halon gas systems installed in
many computer rooms. If the smoke control system tried to vent a room
with such a system, it would probably vent the fire suppressing gas as
well. Removing the gas lets the fire continue burning. Also, pressurizing
the areas surrounding an extinguisher equipped room reduces the
effectiveness of the system as well. Air forced into the room from the
outside by pressure can provide the fire with the oxygen it needs to
continue burning. So, gas-based fire extinguishers and smoke control
systems should not be active at the same time in the same area.
The smoke control system receives the location of the fire from the fire
panel. The fire panel uses a combination of smoke and heat sensors to
determine where the fire is located.
In the event that signals are received from more than one smoke zone,
the smoke control system should continue automatic operation in the
mode determined by the first signal received.
Smoke control systems should never be triggered by manual pull boxes.
The risk of someone pulling a box someplace other than the fire zone is
too high for you to trust your smoke control system to this form of
activation.
All smoke control systems installed in buildings must meet the
standards established by the National Fire Protection Association in
their publication NFPA 92A, Smoke Control Systems, 1988 edition. You
can find additional information regarding fire alarm control units in the
Underwriters Laboratories Inc. Standard UL 864.
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