The Curvent Fire King ventilator is a multipurpose fire and natural ventilator. In the event of fire, the ventilator doors automatically open on gravity, causing a “chimney effect” to allow hot gasses to escape, preventing fire spread while protecting the building’s structural integrity against building collapse. The smokeless layer of fresh air created at lower level creates safe evacuation passage for people and assists in fire fighting disciplines. Continuous natural ventilation is standard with the assurance of a highly effective fire ventilator, designed to save lives. The patented curved sides enhances the co-efficient capabilities of the ventilator and provides appealing aesthetics that remains the first choice with architects, engineers and specifiers.