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Thermal imaging comparison of maximum surface temperatures achieved on N95 filtering facepiece respirators with and without exhalation valves at sedentary breathing volumes.

Authors
Monaghan-WD; Roberge-MR; Rengasamy-M; Roberge-RJ
Source
J Int Soc Respir Prot 2009 Mar; 26(I-II):12-19
NIOSHTIC No.
20035806
Abstract
One of the purported benefits of exhalation valves on filtering facepiece respirators is increased wearer comfort through enhanced elimination of exhaled breath-associated heat to the environment, but published data attesting to the efficacy of these valves to accomplish this action is scant. This breathing mannequin-based study utilized infrared camera technology to examine the maximum surface temperature attained in two models of N95 filtering facepiece respirators with exhalation valves compared to two similar respirators without exhalation valves. No significant differences were noted when comparing respirators without valves to respirators with valves from the same manufacturer; however, respirators with valves, as a group, tended to exhibit a greater maximal surface temperature than respirators without valves (p=0.05). At sedentary breathing volumes of one hour duration, N95 filtering facepiece respirators with exhalation valves may offer no benefit in heat dissipation over that of similar filtering facepiece respirators without exhalation valves.
Keywords
Respirators; Respiratory-protective-equipment; Personal-protective-equipment; Personal-protection; Author Keywords: filtering facepiece respirators; exhalation valves; surface temperatures; infrared camera imaging
Contact
Raymond J. Roberge, Centers for Disease Control, National Institute for Occupational Safety and Health, National Personal Protective Technology Laboratory, 626 Cochrans Mill Road, Pittsburgh, PA 15236
Publication Date
20090301
Document Type
Journal Article
Email Address
RRoberge@cdc.gov
Fiscal Year
2009
NTIS Accession No.
NTIS Price
Issue of Publication
I-II
ISSN
0892-6298
NIOSH Division
NPPTL
Source Name
Journal of the International Society for Respiratory Protection
State
PA
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