Really tight houses can get down to 1 ach50 or even less. The envelope tightness test commonly referred to as blower door testing required by the residential provisions of the 2015 international energy conservation code 2015 iecc as modified by part 3 of the2016 supplement to the state energy conservation construction code 2016 ecs. In fact the passive house program requires a maximum infiltration rate of 0 7 ach50.
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