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SCS Series Manual —
P/N 15712:L 7/18/16
Concepts of Smoke Control
Basic Smoke Control System Operation
(S1), ensuring that the return damper (R1) is open, and turning on the return fan. Pressurization of all other areas is accomplished by closing
the return dampers, ensuring that the supply dampers are open, and turning on the supply fan. This example is using zoned smoke control
with mechanical exhaust.
Figure 2.23 Smoke Control Using Fans and Dampers
This example, although very basic, serves as the groundwork for zoned smoke control systems using pressurization and mechanical exhaust.
Figure 2.24 Eight Story Building
The building shown in Figure 2.24 is eight stories, where each floor is designated as a smoke control zone. There is also a stairtower and ele-
vator shaft to consider. The system depicted here is a dedicated system that will utilize pressurization. The stairtower has a multiple injection
system and the elevator hoistway will only be pressurized to prevent the migration of smoke (it will not be used for evacuation). All dampers
are normally open. When a fire is detected the following must occur:
•
Pressurization of the stairwell and elevator shaft
•
Pressurization of all non-smoke zones
•
Evacuation of the smoke zone
Exhaust to
Outside
Supply from
Outside
Return Fan
Supply Fan
Additional
Smoke Control
Zones
R1
Open
S1
Closed
R2
Closed
S2
Open
Smoke Zone
Smoke Control
Zone
Stairtower
Supply
Fan
Return
Fan
Elevator
Shaft
Two Supply and
Two Return Dampers at
each Floor
Stairtower
Fan
Elevator
Hoistway Fan
Roof
Floor 8
Floor 7
Floor 6
Floor 5
Floor 4
Floor 3
Floor 2
Floor 1