Blower Door Testing - Special features of Large Buildings (q50-value)

As Passive House buildings get larger, there is a requirement not just to test for air changes per hour (n50) but also permeability (q50). The larger the building, the easier it is to reach the n50 of 0.6 ACH. In fact, large buildings with an n50 of 0.6 ACH could still have a lot of large leaks which could cause heat loss, discomfort and structural damage. This article distinguishes between n50 and q50 including upper limits for both.

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