Variety modes and chaos in smoke ventilation by ceiling chamber system

This  paper  referrer  to  the  existence  of  the variety modes and the 'chaos' in building ventilation system, and provides some instances of such varieties and the chaos in forced ceiling chamber smoke exhaust system in building fire. The numerical  calculations are executed by the Newton-Raphson method for the ventilation network models. The ventilation variety up to five modes and the chaos characteristics are obtained  as  the natural result of the non-linear system and illustrated in figures and maps. We inquire further into the dangerous back flow at the smoke vent which may be caused by certain conditions of the heat supply rate and the geometry of ceiling space.