This standard sets upper limits of leakage area and provides a method of classifying airtightness for detached, single-family residential buildings.
This standard does not apply to buildings that are conditioned for human comfort less than 876 hours of the year.
Although this standard is intended to reduce energy use associated with air leakage through the envelope of residential buildings, use of this standard may preclude the use of air infiltration alone to achieve adequate indoor air quality. The reduction of air leakage is separate from the need to provide adequate ventilation, adequate combustion air, and adequate indoor air quality. Consideration of these issues is the responsibility of the user.
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