Chapter 1 Smoke control overview
Zoned smoke control cannot limit the spread of smoke within the smoke control zone. Consequently, occupants of the smoke control zone must evacuate as soon as possible after fire detection.
Figure 3: Sample arrangements of smoke control zones
+: Represents
When an HVAC system serves multiple floors (Figure 4 on page 7) and each floor is a separate zone, the following sequence provides smoke control:
1.In the smoke control zone, the smoke damper in the supply duct closes and the smoke damper in the return duct opens.
2.In adjacent and/or unaffected zones, the smoke dampers in the return ducts close and smoke dampers in the supply ducts open.
3.If the system has a return air damper, it closes.
4.Supply and return fans activate.
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