Air Tightness Testing

Our director Toby Tilsley is an Air Tightness Testing and Measuring Association (ATTMA) registered air tightness tester. He is certified to test buildings up to 4000m3 gross envelope volume.

Air tightness testing, also known as blower door testing, is a procedure that measures a building's airtightness by using a fan to create a pressure difference, revealing air leaks and helping to improve energy efficiency and indoor air quality.

All exterior openings (windows, doors, etc.) are sealed except for the blower door and fan. The fan is turned on, and the pressure difference is measured. Airflow through the fan is measured, and the results are used to calculate the building's air leakage rate (often expressed as air changes per hour at 50 Pascals, or ACH50).

Blower door testing can be applied in a number of ways:

New buildings: Blower door tests are often used to ensure buildings meet air tightness standards and to identify potential problems before they are covered up.
Existing buildings: They can be used to assess the air tightness of older homes and identify areas for improvement.
Passive house certification: Blower door tests are a crucial part of the certification process for passive houses, which are designed to be extremely air tight and energy-efficient.
Ductwork testing: Blower door technology can also be used to test the airtightness of ductwork.

Please get in touch today to enquire about your next blower door test and how we can help you.

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