A specialized diagnostic procedure is employed to measure the airtightness of a building. This test utilizes a calibrated fan temporarily installed in an exterior door frame to pressurize or depressurize the structure. The resulting airflow required to maintain a specific pressure difference between the inside and outside reveals the extent of air leakage. For example, a building exhibiting a high airflow rate demonstrates significant air leakage, indicative of numerous gaps and cracks in the building envelope.
This method is crucial for identifying energy inefficiencies and sources of discomfort within a building. By pinpointing areas of excessive air leakage, building professionals can prioritize insulation upgrades, air sealing measures, and other energy-saving renovations. The implementation of such measures leads to reduced energy consumption, lower utility bills, improved indoor air quality, and enhanced occupant comfort. Its development marked a significant advancement in building science, providing a standardized approach to quantifying building airtightness and informing effective remediation strategies.
