Air Leaks Happen at the Surface, Not in the Volume

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So why do we still report blower-door results in 'air changes per hour'?

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[](http://www.greenbuildingadvisor.com/blogs/dept/building-science/air-leaks-happen-surface-not-volume)

During the Westford Symposium on Building Science in 2010,* I was watching the tweets from the people who were there. At one point, I saw this one: "@EFL_Guy: 'Air leaks through surfaces, not volume' [Joe Lstiburek](http://joelstiburek.com)." I'd been meaning to blog about this issue for a while, so I wrote an article about it. Now, a couple of years later, it's time for a little update.

URL: http://www.greenbuildingadvisor.com/blogs/dept/building-science/air-leaks-happen-surface-not-volume