Abstract
AbstractThis article describes a simplified method to calculate a building‐specific subslab to indoor air attenuation factor using data collected during pressure‐field extension testing similar to industry standards for radon mitigation. It also describes a simplified method to calculate the radius of influence for a conventional suction point using a mass flux‐balance model. The analysis is based on three simple measurements: (1) the extraction flow rate, (2) cross‐slab applied vacuum at a radial distance of 3 feet, and (3) cross‐slab applied vacuum at a radial distance of 10 feet. The intent is to provide a practitioner with a rapid and useful screening‐level assessment of whether the benefits of reduced mitigation system costs warrant an investment in a more detailed mathematical analysis of the flow and vacuum data. In addition, this may also help a practitioner to make real‐time decisions regarding placement of communication test points during pressure‐field extension testing.
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