What is the difference between Positive Pressure Ventilation and Negative Pressure Ventilation?
PPV gives you complete control over where the exhaust air travels by choosing the exhaust opening. With Positive Pressure Ventilation, you blow into the structure and literally “pressurize” the entire structure. This gives you the ability to ventilate the entire structure of dust particles, heat, gas, smoke or any other type particulate temporarily suspended in the air. In Negative Pressure Ventilation, a suction fan is placed in a doorway or window “pulling” the air outward. This is called ejection and is a very inefficient method of ventilation because the blower is only able to remove air that is in its general vicinity.
