Negative air pressure is a dangerous and expensive problem in homes across the country. Two causes of negative air pressure are unable to be controlled: wind pressure and the ‘stack effect’. Wind forces air in on some sides and forces it out on others.

Is Negative Airflow good?

Negative pressure would mean that air is being sucked into your case from all the tiny gaps you can’t control and don’t have filters on, which means less efficient cooling over time. Aim for slightly positive pressure, with slightly higher intake CFM than exhaust CFM.

Should a house have negative or positive pressure?

Neither positive nor negative air pressure in a home is good, as either puts pressure on the building envelope that promotes air leakage and they will each have different effects and impacts depending on the season, the temperatures and the humidity levels.