Official Blower Door Test Well we've been in the house for almost a year now, and we are just now getting all of the necessary documents sent to Passive House Academy (PHA) for final certification. The big remaining items are: Installation PSI values for our windows - results for this will be in a separate blog post. Zehnder Commissioning to verify airflow in each room and ensure proper balancing from the supply and exhaust from the unit Official Blower Door Test So this post will go into some depth on what is required for the Passive House Institute Airtight Test Calculate the House Air Volume This is maybe the biggest difference between the ASTM and European Standard. We calculate the air volume of the house from slab to interior drywall and exclude ALL interior wall and floor air volumes. Essentially the "visible air volume" inside the house. Sketchup makes this much easier! I broke up the volume into 4 components Volume of the Basement = 8,888 cuft Volume of the 1st...