Radon mitigation systems installed in houses have sometimes been modified and applied to schools to reduce elevated radon levels. However, substructure type and building size and configuration, heating, ventilating, and air-conditioning (HVAC) system design and operation, and location of utility supply lines have been identified as school characteristics that can influence radon entry and possibly require radon mitigation strategies different from those for residential housing. One of the most significant factors contributing to radon entry in schools is room depressurization resulting from the HVAC system's exhausting more air from a room than the supply fan is furnishing to the room. Conversely, if the HVAC system pressurizes the room, it can prevent radon entry as long as-the fan is operating. This paper represents a current assessment of schoo
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