A building should always have roof exhausters; they are very necessary and provide ventilation to the whole building. Roof exhauster is commonly found in schools, hospitals, and high rise apartments, commercial and industrial apartments. A reliable ventilation system that can operate during a fire is both vital and essential. It prevents smoke logging, allows people to escape quickly, and minimizes damages. Roof exhauster fans would mechanically vent heat and smoke under emergency fire conditions. The concept of venting smoke and heat was first outlined by Industrial Risk Insurers (IRI). Use of powered ventilation could eliminate the problems experienced with gravity vents. In addition to the reliability and effectiveness of this powered ventilation concept, to vent heat and smokes has these specific advantages like it is not dependent on air temperature differential or wind direction and velocity to create air movement.
Accurate ventilation needs that there be a flow of air into the room and the temperature and humidity should be maintained within a range that allows adequate evaporation of sweat from the skin. It was previously thought that the anxiety, nuisance and laziness often linked with bad ventilation were caused totally by the enhance in the quantity of CO2 and decreased oxygen in the air. There is proof, however, that the effects depend largely on the interference with the mechanism of heat regulation in the body. Lack of air flow and increase the relative humidity and temperature prevent normal evaporation of perspiration and heat loss from the skin surface.
There is usually a substantial cost saving in the purchase and installation of the dual purpose system. Maintenance cost for building and equipment is frequently reduced. The system can be effectively used in multi storied and below grade building areas. Reliability of operations is assured because powered ventilators are in daily use and receive regular inspection and maintenance.

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