Pressure drop of filtering facepiece respirators: How low should we go?
Pressure drop of filtering facepiece respirators: How low should we go?
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DOI：
10.13075/ijomeh.1896.00153
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发表时间：
2015
影响因子：
2
通讯作者：
Sebastian JM
中科院分区：
文献类型：
--
作者：
Kim JH;Roberge RJ;Powell JB;Shaffer RE;Ylitalo CM;Sebastian JM
本研究旨在确定受试者在静坐和中低作业率下，在鼻呼吸和口腔呼吸时，佩戴低过滤面罩(PR)时所遇到的平均最大过滤阻力(RFilter)。10名受试者在静坐状态和中低作业率下，分别测量了额定RFilter为29.4Pa58.8Pa88.2Pa3种RFilter(在85 L/min恒定风速下测量)的平均RFilter压力。29.4PR的平均RFilter显著低于其他2个PR(p<；0.000)，但58.8pA和88.2pA过滤阻力的平均RFilter无显著差异(p>；0.05)。对于口呼吸和鼻呼吸，以及与久坐活动相比，运动的平均RFilter更大(p<；0.001)。所有3个受试者的平均口腔和鼻腔RFilter均达到或低于吸气阻力检测的最低阈值(58.874.5pA/1×S−1)，这可能解释了先前报道的佩戴这些低RFilter时没有显著的主观或生理差异的原因。将过滤面罩RFilter降低到88.2Pa.(在85 L/分钟恒定气流下测量)可能不会给佩戴者带来额外的主观或生理益处。
This study was undertaken to determine the mean peak filter resistance to airflow (Rfilter) encountered by subjects while wearing prototype filtering facepiece respirators (PRs) with low Rfilter during nasal and oral breathing at sedentary and low-moderate work rates. In-line pressure transducer measurements of mean Rfilter across PRs with nominal Rfilter of 29.4 Pa, 58.8 Pa and 88.2 Pa (measured at 85 l/min constant airflow) were obtained during nasal and oral breathing at sedentary and low-moderate work rates for 10 subjects. The mean Rfilter for the 29.4 PR was significantly lower than the other 2 PRs (p < 0.000), but there were no significant differences in mean Rfilter between the PRs with 58.8 and 88.2 Pa filter resistance (p > 0.05). The mean Rfilter was greater for oral versus nasal breathing and for exercise compared to sedentary activity (p < 0.001). Mean oral and nasal Rfilter for all 3 PRs was at, or below, the minimal threshold level for detection of inspiratory resistance (the 58.8–74.5 Pa/1×s−1), which may account for the previously-reported lack of significant subjective or physiological differences when wearing PRs with these low Rfilter. Lowering filtering facepiece respirator Rfilter below 88.2 Pa (measured at 85 l/min constant airflow) may not result in additional subjective or physiological benefit to the wearer.
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DOI：
10.1097/jom.0b013e31817f458b
发表时间：
2009-01-01
影响因子：
3.2
作者：
Harber, Philip;Bansal, Siddharth;Wu, Samantha
通讯作者：
Wu, Samantha
影响因子：
5
作者：
KOEHLER, JL;LEITH, D
通讯作者：
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影响因子：
3.5
作者：
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通讯作者：
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影响因子：
9.6
作者：
ARAD, M;HERUTI, R;EPSTEIN, Y
通讯作者：
EPSTEIN, Y
影响因子：
24.3
作者：
Barry, PW;Mason, NP;Richalet, JP
通讯作者：
Richalet, JP