||Sub-Slab Pressure Field Extension in Schools and Other Large Buildings.
Harris, D. B. ;
Craig, A. B. ;
Leovic, K. W. ;
||Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Air pollution control ;
Indoor air pollution ;
Stationary sources ;
Active subslab depressurization ;
Pressure field extension
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
The paper discusses EPA's experiences using pressure field extension (PFE) to design active subslab depresurization (ASD) systems to reduce radon levels in old and new schools, including instances where the data collected resulted in the installation of smaller systems than expected and selection of high vacuum fans instead of 'normal' mitigation fans. A central collection system for use under very large slabs is discussed and PFE data are given for a hospital under construction. The most direct method of projecting or measuring the performance of an ASD system is to measure the strength and extent of the pressure field established under the slab. The PFE can be determined (during diagnostics) to help design an ASD system and (following installation) to ascertain system performance. In schools and other large buildings, these data are invaluable to provide a system that will mitigate the building without undue cost escalation.