||Effects of Natural and Forced Basement Ventilation on Radon Levels in Single Family Dwellings.
Cavallo, A. ;
Gadsby, K. ;
Reddy, T. A. ;
||Princeton Univ., NJ. Center for Energy and Environmental Studies.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Residential buildings ;
Pollution control ;
Indoor air pollution ;
Pressure reduction ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The report gives, for the first time, results of an extensive study of the effect of ventilation on radon concentrations and radon entry rate in a single-family dwelling. Measurements of radon concentrations, building dynamics, and environmental parameters made in Princeton University research houses over several seasons and under different building operating conditions show the functional dependence of radon entry rate on basement depressurization. The work clarifies the role of natural ventilation in reducing indoor radon concentrations. The work shows conclusively that natural ventilation can decrease radon levels two ways: (1) by simple dilution, and (2) by providing a pressure break (defined as any opening in the building shell that reduces the outdoor/indoor differential pressure). This reduces building depressurization and thus the amount of radon-contaminated soil gas that is drawn into the building.