Definition for word: Blower Door Test

One of the most important tests done to assess a home’s energy performance. The test involves sucking air out of a house in order to identify leaks in the building envelope and establish a leakage rate.

Referrence from

A basic blower-door system includes three components: a calibrated fan, a door-panel system, and a device to measure fan flow and building pressure. The blower-door fan is temporarily sealed into an exterior doorway using the door-panel system. The fan is used to blow air into or out of the building, which creates a small pressure difference between inside and outside. This pressure difference forces air through all holes and penetrations in the building enclosure. The tighter the building (e.g. fewer holes), the less air is needed from the blower door fan to create a change in building pressure.

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