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Effect of exhaled moisture on breathing resistance of N95 filtering facepiece respirators.

Authors

Roberge-RJ; Bayer-E; Powell-JB; Coca-A; Roberge-MR; Benson-SM

Source

Ann Occup Hyg 2010 Aug; 54(6):671-677

Link

http://dx.doi.org/10.1093/annhyg/meq042 

NIOSHTIC No.

20036989 

Abstract

This study evaluated the effect of exhaled moisture on the breathing resistance of three classes of filtering facepiece respirators (FFR) following 4 h of continuous wear at a breathing volume of 40 L min-1, utilizing an automated breathing and metabolic simulator as a human surrogate. After 4 h, inhalation and exhalation resistance increased by 0.43 and 0.23 mm of H2O pressure, respectively, and average moisture retention in the respirators was 0.26 ml. Under ambient conditions similar to those of the current study, and at similar breathing volumes, it is unlikely that exhaled moisture will add significantly to the breathing resistance of filtering facepiece respirators (FFR) over 4 h of use.

Keywords

Respirators; Respiratory-protection; Respiratory-protective-equipment; Personal-protective-equipment; Ventilation; Breathing; Filters; Author Keywords: breathing resistance; filtering facepiece respirators; moisture; N95; respiratory protective equipment

Contact

Raymond J. Roberge, National Institute for Occupational Safety and Health, National Personal Protective Technology Laboratory, Pittsburgh, PA 15236, USA

CODEN

AOHYA3

Publication Date

20100801

Document Type

Journal Article

Email Address

rroberge@cdc.gov

Fiscal Year

2010

NTIS Accession No.

NTIS Price

Issue of Publication

6

ISSN

0003-4878

NIOSH Division

NPPTL

Priority Area

Healthcare and Social Assistance

Source Name

Annals of Occupational Hygiene

State

PA