Andover Controls Infinity User Manual

The Fundementals of Smoke Control
1-4 Infinity Smoke Control Guide
TOC
Figure 1-2. Air Pressure Containing Smoke
You lower the air pressure in the smoke-filled area by shutting off all air
flow into it and turning on the exhaust fans from the area to full capacity.
This technique pulls the smoke out of the area and vents it outside of the
building.
You pressurize the areas and floors surrounding the fire by turning off
all exhaust systems (including closing any exhaust dampers) and forcing
supply air to those areas at full capacity. The air in the pressurized areas
tends to leak into the smoke zone, using the same cracks and holes that
the smoke would use to get out. This airflow into the burning room
keeps the smoke from spreading.
Areas that are neither being pressurized nor depressurized (i.e. areas far
away from the fire) have both their air inlets and air return systems
turned off. Turning off the air return prevents the smoke that is being
vented into the return air system from coming into the area.
In cases where there are large openings (such as an open doorway)
between the area on fire and an adjacent area, smoke can be confined by
a large volume of air. Pumping large amounts of air through the adjacent
space creates a constant draft through the opening into the smoke zone
(as shown in the next illustration). The draft through the open space
keeps back the smoke, confining it to the smoke zone. The amount of air
required to keep the smoke from penetrating the open space is quite
large, so you should avoid this sort of situation when possible.
Air Pressure
Positive
Air Pressure
Positive
Air Pressure
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Air Pressure
Positive
Air Pressure
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Air Pressure
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Air Pressure
Positive
Air Pressure
Positive
Negative Pressure
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Andover Controls Infinity Specifications

General

Brand	Andover Controls
Model	Infinity
Category	Controller
Language	English