Air tightness testing is a process used to measure the amount of air leakage in a building. The test involves creating a pressure difference between the inside and outside of the building and then measuring the amount of air that flows through any leaks or gaps. The purpose of air tightness testing is to identify areas where air can enter or escape a building, which can cause energy inefficiency, poor indoor air quality, and even structural damage.
The test is typically performed by using a fan to pressurize or depressurize the building while measuring the resulting airflow. The difference in pressure between the inside and outside of the building is measured using specialized equipment, and the results are expressed in air changes per hour (ACH) or cubic feet per minute (CFM).
A good result for air tightness testing is one that indicates a low level of air leakage. The lower the ACH or CFM result, the more airtight the building is. In general, a result of less than 0.6 ACH is considered very good, while anything above 1.5 ACH indicates that there is significant room for improvement.
Improving a building’s air tightness can have a number of benefits. Reducing the amount of air leakage can help to improve energy efficiency and reduce heating and cooling costs. It can also help to improve indoor air quality by reducing the number of pollutants and allergens that can enter the building from outside. In addition, improving air tightness can help to prevent moisture buildup and reduce the risk of structural damage due to rot or mould.
Overall, air tightness testing is an important tool for ensuring that a building is efficient, healthy, and structurally sound. By identifying areas of air leakage, building owners and managers can take steps to improve their building’s performance and reduce its environmental impact.