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Positive pressure ventilation – how does it work

Positive pressure ventilation – the safe and quick method for ventilation in the case of heat, gas, dust and smoke

High pressure fans serve the quick, forced ventilation of rooms in residential buildings, halls, multi-storey car parks, etc in the case of smoke, gas and heat caused by fires. During positive pressure ventilation, high-performance fans are positioned outside the building and a stream of fresh air is applied. The conical air flow is compressed at the entrance to the building, thus excluding the possibility of air back-flow. The light initial positive pressure sets the air masses in the building in motion in the direction of an existing opening, such as a window or smoke flap etc., or one that is subsequently created. The resulting air flow then transports smoke, heat and poisonous gases out into the ambient air without major turbulence Positive pressure ventilation works independently of the size of the building. The effect can be increased by the use of several fans, as shown here in the case of a fire in a multistorey building. In addition, adjacent areas can be kept free of smoke and gas.

The operational advantages of positive pressure ventilation are Simple operation of the fan, which merely involves outdoor positioning and the starting of the engine No access problems at the scene of the emergency, as the fresh air cone can cover the door or opening from a distance of 2-3m During positive pressure ventilation, smoke, heat and hazardous gases are removed by the air flow, thus excluding the possibility of hitting the firefighting team If the high-performance fans are brought into position at the beginning of the emergency, the crew can work with fresh air at its back and quickly has improved visibility The improvement in visibility means that source of the fire can be more quickly localised and attacked There is a remarkable drop in ambient temperatures The air flow deals with the water vapour from extinguishing Positive pressure ventilation removes smoke evenly from floor, ceiling and corner areas During positive pressure ventilation, the air flow can be controlled by opening and closing doors and windows, which is most important during evacuation procedures.