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Horizontal fire ventilation
Where the outlets are found on the same level as the fire, so that the flow of fire gases takes place horizontally. This would be the case, for example, in apartment fires or in certain types of industrial buildings where it is tough, or near improbable, to make openings on the roof and where there are no skylights or vents.

Vertical fire ventilation
Where the outlets are overhead the fire, often as high as possible in the building so that the flow of fire gases takes place vertically. The outlet is usually employed by creating an opening on the roof surface, or via existing vents (windows or vents/shutters).

Mechanical fire ventilation
This can mainly be implemented as positive pressure ventilation or negative pressure ventilation. The mechanical ventilation must be combined with creating openings, so as to achieve horizontal or vertical ventilation.

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