Nanotechnology Project

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Environment, Health and Safety Research

Bypass Leakage and Recirculation of Workplace Aerosols

Project Information

Principal InvestigatorAnthony T Zimmer
InstitutionNational Institute for Occupational Safety and Health
Project URLView
Relevance to ImplicationsHigh
Class of NanomaterialIncidental Nanomaterials
Impact SectorHuman Health
Broad Research Categories Exposure
Generation, Dispersion, Transformation etc.
NNI identifier

Funding Information

Anticipated Total Fundingn/a
Annual Fundingn/a
Funding SourceNIOSH
Funding MechanismIntramural
Funding SectorGovernment
Start Year2003
Anticipated End Year2009


An investigation of the significance of bypass leakage in filtration systems, and in particular how this affects exposure to nanometer-scale aerosol particles when recirculation systems are used. Non-idealities of aerosol filtration represents an area with little known research. Fundamental research to investigate bypass leakage (i.e., aerosols passing around a filter without control) and recirculation (i.e., routing a filtered effluent back into a workspace) is being conducted using experimental and mathematical techniques. Research findings will not only help individuals in the workplace, but is readily applicable to chemical and biological terrorist research.