Measuring airtightness

Measuring airtightness

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Caption: Measuring airtightness in a home with a blower door test. This test determines how airtight a building is and can also be used to find leaks. A fan is mounted in the frame of an exterior door and used to pull air out of the building. As the air pressure inside the building drops, air flows in from the outside through any gaps or small openings. A gauge attached to the fan measures how much air was taken out of the building, allowing airtightness to be measured. Photographed in Fort Garland, Colorado, USA.

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