Positive tension ventilation any of various sorts of mechanical ventilation wherein gas is sent into the airways and lungs less than good stress, manufacturing constructive airway strain for the duration of inspiration; it could be completed by using either an endotracheal tube or simply a nasal mask. See also ventilator. https://ventilationductwork46778.wssblogs.com/37264548/the-greatest-guide-to-ventilation-installation