Percent Inward Leakage : The ratio of vapor concentration inside the ensemble versus the vapor concentration outside the ensemble expressed as a percentage
NFPA 1994 Standard on Protective Ensembles for First Responders to CBRN Terrorism Incidents, 2007 ed. http://media.bmt.org/bmt_media/resources/39/NFPA19 94.pdf, (Std: Prot Ens for First Resp to CBRN Teror Incid - Amer) {438 NFC}