A predictive air infiltration model - long-term field test validation.

Describes a predictive model for air infiltration in residential structures. Uses wind speed and outdoor temperature data, along with selected building and site parameters to predict average infiltration. Presents long-term field validation results obtained in a portable test structure, together with long-term data from 3 unoccupied test houses at the Owens-Corning Technical Centre. Finds that the ratio between predicted and measured infiltration peaks near one in all comparisons. The estimated standard deviation of the ratios decreases with longer averaging times. Values decrease from +-35% to +-7% in moving from a 1/2-hour infiltration prediction to a one-week prediction in the portable test structure. In the test houses, the values decrease from +-66% to +-19% in moving from a one-hour prediction of infiltration to a one-week value.