blæserdørtest

The blæserdørtest, often translated as a "blower door test," is a diagnostic procedure used to measure the airtightness of a building's envelope. This test is crucial for evaluating energy efficiency and identifying potential sources of air leakage.

During a blæserdørtest, a powerful fan is mounted into an exterior doorway of the building, creating a controlled pressure difference between the inside and outside. This fan either depressurizes or overpressurizes the building, forcing air through any cracks, gaps, or openings in the building's shell. Sensors measure the airflow rate required to maintain this pressure difference.

The results of the test provide a quantitative measure of the building's air leakage, often expressed as air changes per hour (ACH) at a specific pressure. A lower ACH indicates a more airtight building, which generally leads to reduced energy consumption for heating and cooling, improved indoor air quality control, and enhanced comfort. Conversely, a high ACH suggests significant air leakage, potentially leading to drafts, increased energy bills, and moisture-related issues.

Professionals use the blæserdørtest to identify specific areas of leakage, such as around windows, doors, electrical outlets, plumbing penetrations, and attic hatches. This information is valuable for builders, homeowners, and energy auditors to implement targeted sealing strategies and improve the overall performance of a building. The test is a standard practice in energy-efficient building certifications and building codes in many regions.