Passive House Airtightness Achieved! We ran a few different tests today to validate our airtightness numbers: Our Field Measured Volume is 29356 CUFT We did a Window Blower Door Test with the Duct Blaster Here are photo's from our "Depressurization Test" 52 CFM50 - 0.106 ACH50 Here are photo's from our "Pressurization Test" 65 CFM50 - 0.133 ACH50 We also ordered the "D Ring" for the blower door to get an accurate Blower Door Number I should note - the tolerance for the D-Ring is: 125 CFM - 30 CFM Here are photo's from our "Depressurization Test" 49 CFM50 - 0.100 ACH50 Here are photo's from our "Pressurization Test" 52 CFM50 - 0.106 ACH50 To average the results we are at 50.5 CFM50 A few notes from the tests: The blower door pressurization test was done in the protected breezeway door vs the duct blaster pressurization test that was done on the open back yard. We did a blower door pressure test up to 90 Pascals to ...