Hinds W C, Bellin P
University of California Southern Occupational Health Center, UCLA School of Public Health 90024.
Am Ind Hyg Assoc J. 1987 Oct;48(10):842-7. doi: 10.1080/15298668791385688.
A performance model for half-mask and single-use respirators is presented. It represents a possible alternative to field measurements of respirator performance. Experimental data on filter and leak performance given in Part I were used to develop a model that allows one to predict 1) the overall respirator penetration as a function of particle size for any work rate and 2) overall total mass penetration for any work rate and exposure aerosol-size distribution for a known respirator filter and facial seal leak condition. A simplified method based on general regression equations is presented that allows one to estimate these quantities based on QNFT (quantitative fit testing) measurements and a knowledge of the exposure aerosol-size distribution. Example calculations are given for a situation in which QNFT gives a fit factor of 50 for a half-mask with dust, fume and mist filter cartridges, but predicted protection factors for various use conditions range from 20 to 81 depending on exposure particle-size distribution and work rate of the wearer.
本文提出了一种半面罩和一次性呼吸器的性能模型。它代表了一种替代呼吸器性能现场测量的可能方法。第一部分给出的关于过滤器和泄漏性能的实验数据被用于开发一个模型，该模型能够让人们预测：1）在任何工作速率下，作为粒径函数的整体呼吸器穿透率；2）对于已知的呼吸器过滤器和面部密封泄漏情况，在任何工作速率和暴露气溶胶粒径分布下的整体总质量穿透率。本文还提出了一种基于通用回归方程的简化方法，该方法能让人们根据定量适合性测试（QNFT）测量结果以及对暴露气溶胶粒径分布的了解来估算这些量。文中给出了一个示例计算，在该示例中，对于配有防尘、防毒和防雾滤盒的半面罩，QNFT给出的适合因数为50，但根据暴露粒径分布和佩戴者的工作速率，各种使用条件下预测的防护因数范围为20至81。
