Positive tension ventilation any of various forms of mechanical ventilation during which gas is shipped to the airways and lungs below beneficial strain, generating good airway tension through inspiration; it might be done by means of either an endotracheal tube or a nasal mask. See also ventilator. The Risk: Airborne https://ventilation47890.bloggazzo.com/36321590/how-ventilation-ductwork-can-save-you-time-stress-and-money