Ventilation: How Air Moves and Why It's Important to Your Home and Health - HealthyHouseInstitute.com

Ventilation: How Air Moves and Why It's Important to Your Home and Health - HealthyHouseInstitute.com: "n order for air to move into or out of a house, there are two basic requirements. First, there must be a path through which the air travels, and second, there must be an air pressure difference to push the air molecules through the pathway."