Field testing and computer modeling were used to study substructure ventilation, as a measure of controlling indoor radon in a house with a cellar. This is a common type of single family dwellings in areas of North England where radon is a problem. Testing carried out in the occupied house found that natural ventilation was not sufficient and both extract and supply ventilation were effective. Extract ventilation produced larger concentration reduction than supply at small air change rates. The house was also modeled by using a computer multi-zone air and pollutant movement simulation package. The simulated results were in good agreement with those measured for a wide range of conditions.
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