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KMID : 1039220220320020146
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Journal of Korean Society of Occupational and Environmental Hygiene
2022 Volume.32 No. 2 p.146 ~ p.152
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Fit Tests for Second-class Half Masks
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Cho Kee-Hong
Kim Hyun-Soo
Choi Ah-Rum
Chun Ji-Young
Kang Tae-Won
Kim Min-Su
Park Kyeong-Hak
Kim Ze-One
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Abstract
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Objectives: The purpose of this study is to confirm whether there is a factor to affect the evaluation of fit test of a 2nd class half masks using a OPC test method.
Methods: Total 34 adults including Males and Females were tested using OPC-based fit testing equipment while wearing a 2nd class half filtered mask.
Results: 1. The result of measuring face dimensions using different tools such as a 3D scanner and digital calipers revealed that the variation of lip width was not statistically significant because there was only a difference of about 4 ㎜. However, it showed that a difference in face length was statistically significant enough with 10 ㎜(p<0.000). 2. The fit factor for each exercise stage according to gender was the highest at 124.54(p<0.001) in Step 3, and the fit factor was the lowest at 73.75 in Step 1. 3. In the evaluation of the degree of fit factor according to gender, female passed 67.44%, which was higher than the value in male(p<0.038). 4. The acceptance rate of the group having a face length of shorter than 110 ㎜ was 91.67%. On the other hand, the acceptance rate of the group with a face length of longer than 110 ㎜ was 47.27%(p<0.000). 5. The fit test was possible because the fit factor with 2nd class half masks corresponding to FFP1(Filtering Face Piece 1) was passed 55% or more.
Conclusions: The test results showed that using a 2nd class half filtered mask, it is important to wear a properly designed mask so that face size does not affect the fit factor.
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KEYWORD
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Fit test, 2nd class half filtered mask, 3D, anthropometric, Leakage
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