Blower door procedure standards?
We just completed our blower door test done after framing and prior to insulation of our new home under construction in Zone 4c Southern Oregon and had fantastic results: With the Panasonic Whisper Green fans taped off it was 83 cfm @63Pascal (.23 ACH63). We couldn’t get a reading at 50 pascal. Unbelievably tight. When we uncovered the bath & kitchen fans it jumped to 172 cfm @50 (.48 ach50). Still meets Passive House standard, but more leakage than is necessary. For some reason the built-in back-draft dampers for the Panasonic fans are designed to not completely close ( they are cup shaped and not round). You could easily feel the cold air pull past your hand during the test.
My question is: What is the standard for this test, bath and kitchen fans open or taped off? Obviously real world results are what really matters, but I am curious what the standard is. By the way, we are installing Lunos HRVs for IAQ with spot ventilation for the baths, kitchen and laundry.
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