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A blower door is a machine used to measure the airtightness of houses. The test will analyze the pressure differential from outside to inside, with a fan creating a pressure of 50 pascals inside the building.

(50 pascals is used to imitate the pressure of a strong wind.)

Blower door tests are done in new construction to ensure building standards and energy performance targets are met. They are also commonly done as part of an energy assessment - in Canada we have the Energuide rating system for homes.

A blower door systems can also be used to:

• measure airflow between building zones
• test ductwork airtightness
• help physically locate air leakage sites in the building envelope.
  

Homeowners will often book an assessment before starting a renovation so they can take advantage of any government incentives for improvements made to their home. The Energy Advisor will perform the blower door test and do a complete walkthrough to locate problem spots around the house.

With any renovation based on increasing the airtightness and insulation levels, the work must include a plan for installing a fresh air machine with heat recovery to ensure consistent fresh air flow.