Natural smoke and heat exhaust ventilation systems (NSHEVS) are designed as safety equipment that would save lives and reduce the destruction of properties. It will work by the upward current of the fume atmosphere. The smokes produced by fire are to be discharged from inside to outside of the building by automatically or manually opening smoke ventilation systems. In the event of a fire, the fire raised the temperature of the room from ambient to hazardous zone. This creates heat buoyancy, which in turn generates a pressure difference within the room, in negative pressure at the floor level and positive pressure below the ceiling or under roof level.

The pressure difference causes the outside fresh air to flow in through the supply air jet stream openings in the lower level of the hall and air to flow out through NSHEV (Natural Smoke and Heat Exhaust Ventilators) in the upper roof area or wherever it was located.