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Noninvasive, quantitative respirator fit testing through dynamic pressure measurement.

Authors
Carpenter-DR; Willeke-K
Source
Am Ind Hyg Assoc J 1988 Oct; 49(10):485-491
NIOSHTIC No.
00182860
Abstract
A noninvasive, quantitative method for the determination of respirator fit was described. The test was based on dynamic pressure measurements using breath holding at negative pressure for a few seconds to assess any pressure decay due to leaks inside the respirator cavity. A light weight pressure transducer attached to the respirator body monitored the pressure decay. The method was illustrated using experiments to determine the effect of sensor and leak location, leak hole size, and respirator cavity volume on the pressure decay of three different respirators. Evaluation of typical pressure decay curves obtained from testing the respirators with and without leak holes of different sizes and locations were presented, and pressure decay functions were described. Respirator fit was related to the equivalent diameter of respirator leaks which was a function of respirator volume and the measured leak slope. The authors note that the method is noninvasive, requires only a few seconds to perform, may be performed before and after actual respirator use, can be performed anywhere, is independent of leak and sensor location, is independent of aerosol deposition in the respiratory tract, can be used to determine the volume of the respirator cavity, and can be used on any type of respirator in which the airflow can be interrupted for a few seconds.
Keywords
NIOSH-Publication; NIOSH-Grant; Screening-methods; Equipment-design; Personal-protective-equipment; Air-purifying-respirators; Respiratory-protective-equipment; Aerosol-particles
Contact
Environmental Health University of Cincinnati Dept of Environmental Health Cincinnati, Ohio 45267
CODEN
AIHAAP
Publication Date
19881001
Document Type
Journal Article
Funding Amount
981435
Funding Type
Grant
Fiscal Year
1989
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-01301
Issue of Publication
10
ISSN
0002-8894
Source Name
American Industrial Hygiene Association Journal
State
OH
Performing Organization
University of Cincinnati, Cincinnati, Ohio
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