Our 2nd blower door test was conducted by Jacob Racusin, who is recently BPI certified and who did it as a part of the Yestermorrow Sustainable Design Certificate course with a group of students.
We got 770 cfm @ 50Pascal which gave us a new number for ACH50 of 1.8, improved from 2.1. The difference was sealing off the chimney cleanout door, which was roughly 8"x12".
We noted a good leak at the mud room door from a warped door that used old barn boards that should have been kild dried, and one on the bulkhead door. These we knew about and could use attention. There was also small leakage around the stove pipe connection to the chimney.
Fixing these might improve the leakage rate to 1.5ACH50.
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