Trane TRACER SUMMIT BAS-APG001-EN Manuel D’Utilisation

The smoke control objective for underground buildings is to contain and 
remove smoke from the alarm zone. The smoke control system fully 
exhausts the alarm zone and provides makeup air to replace the 
exhausted air.

Setup and zoning of the smoke detectors is part of the fire alarm system 
engineering effort. The fire alarm system signals the smoke control 
system to start automatic smoke control operations.

In NFPA 101 (NFPA 2003, Life Safety Code), chapter 11.7 states that an 
underground building with over 100 occupants must have an automatic 
smoke venting system. Chapter 14.3, for new educational occupancies, 
provides smoke zoning requirements. Chapter 12.4.3.3 states that 
automatic smoke control must be initiated when two smoke detectors in a 
smoke zone activate. Chapter 12.4.3.3 states that the system must be 
capable of at least 6 air changes per hour.

The appropriate smoke detection and system activation approach 
depends on the specifics of the smoke control system and on the code 
requirements. Automatic activation has the advantage over manual 
activation. Automatic activation provides fast and accurate response. 
Each smoke control application has detection and activation 
requirements: 

Zoned smoke control

Stairwell smoke control

Elevator smoke control

Atrium smoke exhaust

Note:
Smoke detectors located in HVAC ducts should not be the 
primary means of smoke control activation. Duct detectors have 
long response times and exhibit degraded reliability when 
clogged by airborne particles. However, a duct detector signal 
may be used in addition to a primary means of activation. For 
more information, refer to Tamura, G.T., Smoke Movement & 
Control in High-Rise Buildings.