The beauty of a blower door is how it measures the pressure. A real one is pretty sophisticated. It measures inside, in the center of the fan and outside. It can compensate for varying outdoor conditions. Once it's done it can give you a number. Personally I only care about them for their ability to pressurize and depressurize a house. Tomorrow I am on a job where we have to run five a the same time and we connect them so they think as one. Pretty high tech. I'd have one if I could just get the fan and the frame. They have tons of uses. Let's say you have vermiculite in you attic and want to remove it without paying thousands of dollars. Pressurize the house, put on a HEPA respirator and vacuum it up.
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Chipping away on a daily basis.
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You know you're an ecorenovator if anything worth insulating is worth superinsulating.
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S-F: "What happens when you slam the door on a really tight house? Do the basement windows blow out?"
Green Building Guru: "You can't slam the door on a really tight house. You have to work to pull it shut."
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