A blower door test evaluates the airtightness of a building and is a code requirement for all new construction before obtaining a Certificate of Occupancy (COO). This applies to residential homes and apartments/condos under four stories. The code mandates an air leakage rate of <4 Air Changes per Hour (ACH) at 50 Pascals of pressure.
Why is the test necessary?
The energy code enforces airtight construction
because it reduces energy consumption and
enhances comfort.
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