Accession Number:

ADA457318

Title:

Respirator Filter Efficiency Testing Against Particulate and Biological Aerosols Under Moderate to High Flow Rates

Descriptive Note:

Final rept., Dec 2003-Oct 2005

Corporate Author:

BATTELLE MEMORIAL INST COLUMBUS OH

Report Date:

2006-08-01

Pagination or Media Count:

183.0

Abstract:

The growing terrorism threat associated with biological and chemical agents presents a challenge to emergency responders, healthcare workers, and the civilian population. Currently, National Institute for Occupational Safety and Health NIOSH-approved respirators are used in various workplace settings to provide protection against harmful aerosols. The primary objective of this project was to evaluate and compare the aerosol filtration performance of NIOSH-approved respirator filters with non-biological inert and biological test aerosols under breather flow rates associated with high work rates. The inert test challenges consisted of solid and oil aerosols having nominal diameters ranging from 0.02 to 3.02 micrometers, spanning the spectrum of potential biological threat agents. As expected, penetration of submicron aerosols was found to increase under increased cyclic and constant flow conditions. The magnitude and significance of this increase was dependent on the specific filter type and design. The most penetrating particle size was generally between 0.1 and 0.2 micrometers for the P100 filters and 0.05 and 0.10 micrometers for the N95 filters. Inert aerosols of similar aerodynamic diameter were shown to provide a reasonable estimate of performance against the biological aerosols tested.

Subject Categories:

  • Pumps, Filters, Pipes, Tubing, Fittings and Valves
  • Chemical, Biological and Radiological Warfare

Distribution Statement:

APPROVED FOR PUBLIC RELEASE