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Today we had our Blow Door test for 12-unit building. A Net Zero building must be exceptionally airtight. Airtightness is verified through a blower door test, which measures how many times the building’s air volume is exchanged per hour at 50 Pascals of pressure (ACH50). For most Net Zero–ready buildings, a strong target is around 1.0–1.5 ACH50. Many conventional new buildings are still in the 2.5–3.0 ACH50 range. Our building achieved an incredible 0.5 ACH50, which is well beyond typical Net Ze
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