At what pressure do doors typically tend to automatically open during testing?

During WBAT, the pressure at which doors typically tend to automatically open is generally around 50 Pa. This phenomenon occurs because the pressure differential created during the testing can cause interior doors, particularly those that are not tightly sealed, to actuate and swing open. At approximately 50 Pa, the forces exerted on the door can overcome the resistance of its hinges and any friction, leading to the door's movement.

This understanding is crucial for testers, as the behavior of doors can impact the overall results of the airtightness test. By being aware of this common occurrence at 50 Pa, testers can take appropriate measures to ensure accurate measurements, such as securing doors or noting any variables that could affect the test outcomes. Recognizing this specific pressure point allows for a more controlled testing environment and leads to a better understanding of the building's airtightness.