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

more information about elevator shaft smoke control, refer to Klote, J.K., 
and Milke, J.A. (Design of Smoke Management Systems, 1992).

Atrium smoke control uses buoyancy to manage smoke in large-volume 
spaces with high ceilings. The buoyancy of hot smoke causes a plume of 
smoke to rise and form a smoke layer under the atrium ceiling. NFPA 
92B (NFPA 2000, Guide for Smoke Management Systems in Malls, Atria, 
and Large Areas) addresses smoke control for atria, malls, and large 
areas. Atrium smoke control techniques consist of smoke exhausting, 
natural smoke venting, and smoke filling.

The smoke exhausting technique employs fans to exhaust smoke from the 
smoke layer under the ceiling. Exhausting prevents the smoke layer from 
descending and coming into contact with the occupants of the atrium 
(Figure 7). Effective smoke removal requires providing makeup air to the 
space. Makeup air replaces the air that is exhausted by the fans. If 
makeup air is not introduced, the space will develop a negative pressure, 
which will restrict smoke movement.