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

Smoke feedback occurs when smoke enters a pressurization fan intake 
and flows into protected spaces. Design techniques reduce the probability 
of smoke feedback:

Supply air intakes located below openings from which smoke might 
flow, such as building exhausts, smoke shaft outlets and elevator 
vents.

Automatic shutdown capability to stop the system in the event of 
smoke feedback.

For more information on smoke feedback, refer to SFPE 1995, Fire 
Protection Engineering Handbook.