Fischell Department of Bioengineering, University of Maryland, College Park, MD 20742, USA.
J Environ Public Health. 2011;2011:473143. doi: 10.1155/2011/473143. Epub 2011 May 12.
A combination of local flow measurement techniques and fog flow visualization was used to determine the inward leakage for two tight-fitting powered air-purifying respirators (PAPRs), the 3M Breathe-Easy PAPR and the SE 400 breathing demand PAPR. The PAPRs were mounted on a breathing machine head form, and flows were measured from the blower and into the breathing machine. Both respirators leaked a little at the beginning of inhalation, probably through their exhalation valves. In both cases, the leakage was not enough for fog to appear at the mouth of the head form.
采用局部流量测量技术和雾化气流可视化技术，对两种密合型动力送风过滤式呼吸器（PAPR），即 3M 轻松呼吸 PAPR 和 SE 400 呼吸需求 PAPR 的向内泄漏进行了测定。将 PAPR 安装在呼吸模拟器头模上，从风机测量流入呼吸模拟器的气流。两种呼吸器在吸气开始时都有少量泄漏，可能是通过其呼气阀。在这两种情况下，泄漏量都不足以使雾化气流在头模的口部显现。
