26 SCS Series Manual — P/N 15712:L 7/18/16
Concepts of Smoke Control Smoke Control System Types
An alternate way to achieve lobby protection is direct pressurization of the
elevator lobbies, as shown in Figure 2.18. Direct pressurization of the lob-
bies tends to provide better protection for the lobbies because higher pres-
sures in that area can be achieved. The higher pressure would better protect
the lobbies against small amounts of smoke which may enter the area.
Another mechanism that can be used along with hoistway pressurization is
exhaust of the fire floor, as shown in Figure 2.19. This is achieved by utiliz-
ing the return air ductwork of the HVAC system. When a fire is detected,
the elevator hoistway is pressurized, all dampers in the return ductwork for
the nonsmoke zones must be closed, the damper for the smoke zone must be
opened, and the exhaust fan must be turned on.
Figure 2.18 Elevator Lobby Pressurization
Figure 2.19 Elevator Smoke Control with Fire Floor
Exhaust
Exhaust Fan
Exhaust
Duct
Fire Floor
Damper
Closed
Damper
Open
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