Blower door tests and Equivalent Leakage Area
In reading Dr. Lstiburek’s book Series “Builders Guide to… ‘name your climate'”, I concluded (though it was never specified quite clearly) that for 1000 CFM at 50 Pa the EqLA was 1 square foot. That would be about 7 CFM50 for each square inch of EqLA.
More recently, in an article by an editor of Journal of Light Construction, a duct blaster was used to conduct a blower door test in a very tight house. The conclusion was that the 50-65 CFM50 equated to an EqLA of about 2 ½ sq. in.. That would be about 23 CFM50 for each square inch of EqLA.
It doesn’t seem that both can be correct – 7 vs. 23. Is there a consensus of what CFM50 equates to a square inch of EqLA?
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